diff --git a/app_web.py b/app_web.py
index 3dbf02f..403c266 100644
--- a/app_web.py
+++ b/app_web.py
@@ -32,6 +32,25 @@ os.environ.setdefault("TELEGRAM_WEB_UI", "1")
 
 logger = logging.getLogger("uvicorn.error")
 
+
+def web_url_prefix() -> str:
+    """反代子路径时设置 WEB_URL_PREFIX=/前缀（勿尾斜杠），与 nginx location 一致。"""
+    return (os.getenv("WEB_URL_PREFIX") or "").strip().rstrip("/")
+
+
+def with_url_prefix(path: str) -> str:
+    path = path if path.startswith("/") else f"/{path}"
+    pre = web_url_prefix()
+    return f"{pre}{path}" if pre else path
+
+
+def app_home_url(*, needauth: bool = False) -> str:
+    pre = web_url_prefix()
+    base = f"{pre}/" if pre else "/"
+    if needauth:
+        return f"{base}?needauth=1"
+    return base
+
 WEB_CONSOLE_AUTH_KEY = "web_console_authenticated"
 
 
@@ -53,7 +72,7 @@ def is_console_authed(request: Request) -> bool:
 def redirect_if_console_unauthed(request: Request) -> Optional[RedirectResponse]:
     if is_console_authed(request):
         return None
-    return RedirectResponse(url="/?needauth=1", status_code=303)
+    return RedirectResponse(url=app_home_url(needauth=True), status_code=303)
 
 
 def json_if_console_unauthed(request: Request) -> Optional[JSONResponse]:
@@ -179,6 +198,7 @@ class WebScraperService:
         self.logs: deque[str] = deque(maxlen=1200)
         self.continuous_task: Optional[asyncio.Task] = None
         self.continuous_started_at: Optional[float] = None
+        self.continuous_start_lock = asyncio.Lock()
 
     def _append(self, text: str) -> None:
         ts = time.strftime("%Y-%m-%d %H:%M:%S")
@@ -425,25 +445,26 @@ class WebScraperService:
         return await self.start_job(f"补抓媒体({len(channels)}个频道)", runner())
 
     async def start_continuous(self) -> str:
-        await self.ensure_ready()
-        if self.is_continuous_running():
-            return "持续抓取已在运行中"
-        if not self.scraper.state.get("channels"):
-            raise ValueError("当前没有监控频道，请先添加频道。")
+        async with self.continuous_start_lock:
+            await self.ensure_ready()
+            if self.is_continuous_running():
+                return "持续抓取已在运行中"
+            if not self.scraper.state.get("channels"):
+                raise ValueError("当前没有监控频道，请先添加频道。")
 
-        async def runner():
-            try:
-                await self._run_and_capture(self.scraper.continuous_scraping())
-            except asyncio.CancelledError:
-                self._append("持续抓取任务已取消。")
-                raise
-            except Exception as e:
-                self._append(f"持续抓取异常：{e}")
+            async def runner():
+                try:
+                    await self._run_and_capture(self.scraper.continuous_scraping())
+                except asyncio.CancelledError:
+                    self._append("持续抓取任务已取消。")
+                    raise
+                except Exception as e:
+                    self._append(f"持续抓取异常：{e}")
 
-        self.continuous_started_at = time.time()
-        self.continuous_task = asyncio.create_task(runner())
-        self._append("已启动持续抓取（含心跳逻辑）。")
-        return "持续抓取已启动"
+            self.continuous_started_at = time.time()
+            self.continuous_task = asyncio.create_task(runner())
+            self._append("已启动持续抓取（含心跳逻辑）。")
+            return "持续抓取已启动"
 
     async def stop_continuous(self) -> str:
         if not self.is_continuous_running():
@@ -678,7 +699,7 @@ async def auth_console_login(request: Request):
 @app.post("/auth/console/logout")
 async def auth_console_logout(request: Request):
     request.session.pop(WEB_CONSOLE_AUTH_KEY, None)
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.get("/api/stats/overview")
@@ -727,6 +748,9 @@ async def index(request: Request):
                 "account_channels": account_channels,
                 "console_authed": authed,
                 "need_auth_banner": request.query_params.get("needauth") == "1",
+                "app_url": with_url_prefix,
+                "url_prefix": web_url_prefix(),
+                "app_home": app_home_url(),
                 "connected": service.is_connected(),
                 "job_running": service.is_job_running(),
                 "job_name": service.job_name,
@@ -773,7 +797,7 @@ async def save_config(request: Request):
         else:
             updates[k] = str(form.get(k, "")).strip()
     write_env_updates(updates)
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/start")
@@ -785,7 +809,7 @@ async def start_scraper(request: Request):
         await service.ensure_ready()
     except Exception as e:
         service._append(f"初始化失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/stop")
@@ -794,7 +818,7 @@ async def stop_scraper(request: Request):
     if redir:
         return redir
     await service.disconnect()
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/channels/add")
@@ -807,7 +831,7 @@ async def add_channel(request: Request, channel_spec: str = Form(...)):
         service._append(msg)
     except Exception as e:
         service._append(f"添加频道失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/channels/add-selected")
@@ -820,14 +844,14 @@ async def add_channels_selected(request: Request):
     ids = [str(x).strip() for x in raw_ids if str(x).strip()]
     if not ids:
         service._append("未选择任何频道，请在列表中勾选后再提交。")
-        return RedirectResponse(url="/", status_code=303)
+        return RedirectResponse(url=app_home_url(), status_code=303)
     for spec in ids:
         try:
             msg = await service.add_channel(spec)
             service._append(msg)
         except Exception as e:
             service._append(f"添加失败（{spec}）：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/channels/remove")
@@ -840,7 +864,7 @@ async def remove_channel(request: Request, channel_spec: str = Form(...)):
         service._append(msg)
     except Exception as e:
         service._append(f"移除频道失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/jobs/scrape")
@@ -853,7 +877,7 @@ async def start_scrape(request: Request, selection: str = Form("all")):
         service._append(msg)
     except Exception as e:
         service._append(f"启动抓取失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/jobs/export")
@@ -866,7 +890,7 @@ async def start_export(request: Request, selection: str = Form("all")):
         service._append(msg)
     except Exception as e:
         service._append(f"启动导出失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/jobs/rescrape")
@@ -879,20 +903,24 @@ async def start_rescrape(request: Request, selection: str = Form("all")):
         service._append(msg)
     except Exception as e:
         service._append(f"启动补抓失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/jobs/continuous/start")
-async def start_continuous(request: Request):
+async def start_continuous_route(request: Request):
     redir = redirect_if_console_unauthed(request)
     if redir:
         return redir
-    try:
-        msg = await service.start_continuous()
-        service._append(msg)
-    except Exception as e:
-        service._append(f"启动持续抓取失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+
+    async def _run_start_continuous() -> None:
+        try:
+            await service.start_continuous()
+        except Exception as e:
+            service._append(f"启动持续抓取失败：{e}")
+
+    asyncio.create_task(_run_start_continuous())
+    service._append("已接收「启动持续抓取」：正在后台连接 Telegram 并启动（请勿重复点击；进度见运行日志）。")
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.post("/jobs/continuous/stop")
@@ -905,7 +933,7 @@ async def stop_continuous(request: Request):
         service._append(msg)
     except Exception as e:
         service._append(f"停止持续抓取失败：{e}")
-    return RedirectResponse(url="/", status_code=303)
+    return RedirectResponse(url=app_home_url(), status_code=303)
 
 
 @app.get("/status")
diff --git a/templates/index.html b/templates/index.html
index 276f6aa..bd18f3a 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -764,7 +764,7 @@
                 <button type="button" class="btn-ghost" data-open="config">环境配置</button>
                 <button type="button" class="btn-ghost" data-open="logs">运行日志</button>
                 {% if console_authed %}
-                <form method="post" action="/auth/console/logout" style="margin:0;">
+                <form method="post" action="{{ app_url('/auth/console/logout') }}" style="margin:0;">
                     <button type="submit" class="btn-ghost">退出验证</button>
                 </form>
                 {% endif %}
@@ -859,16 +859,16 @@
             <p class="alert-warn" role="alert">客户端：{{ error }}</p>
             {% endif %}
             <div class="btn-row">
-                <form method="post" action="/start">
+                <form method="post" action="{{ app_url('/start') }}">
                     <button class="btn-primary" type="submit">初始化 / 连接 Telegram</button>
                 </form>
-                <form method="post" action="/stop">
+                <form method="post" action="{{ app_url('/stop') }}">
                     <button class="btn-danger" type="submit">断开 Telegram</button>
                 </form>
-                <form method="post" action="/jobs/continuous/start">
+                <form method="post" action="{{ app_url('/jobs/continuous/start') }}">
                     <button class="btn-primary" type="submit">启动持续抓取（含心跳）</button>
                 </form>
-                <form method="post" action="/jobs/continuous/stop">
+                <form method="post" action="{{ app_url('/jobs/continuous/stop') }}">
                     <button class="btn-danger" type="submit">停止持续抓取</button>
                 </form>
             </div>
@@ -892,14 +892,14 @@
                         <strong>添加</strong>：<code>@用户名</code>、<code>-100…</code>、<code>https://t.me/xxx</code>。
                         不支持仅靠群内显示标题。
                     </p>
-                    <form method="post" action="/channels/add" class="form-inline">
+                    <form method="post" action="{{ app_url('/channels/add') }}" class="form-inline">
                         <input type="text" name="channel_spec" placeholder="@channel 或 -100… 或 https://t.me/…" aria-label="要添加的频道" />
                         <button class="btn-primary" type="submit">添加</button>
                     </form>
                     <p class="hint">
                         <strong>移除</strong>：<code>all</code>；<code>1,2</code>；<code>-100…</code>；<code>@用户名</code> / t.me（须已在监控中）。
                     </p>
-                    <form method="post" action="/channels/remove" class="form-inline">
+                    <form method="post" action="{{ app_url('/channels/remove') }}" class="form-inline">
                         <input type="text" name="channel_spec" placeholder="all 或 1,2 或 -100… 或 @name" aria-label="要移除的频道" />
                         <button class="btn-danger" type="submit">移除</button>
                     </form>
@@ -907,15 +907,15 @@
                 <div class="ops-block">
                     <h4>任务（抓取 / 导出 / 补媒体）</h4>
                     <p class="hint">范围：<code>all</code>、<code>1,3</code>、<code>-100…</code> 或已在监控的 <code>@</code> / 链接。</p>
-                    <form method="post" action="/jobs/scrape" class="form-inline">
+                    <form method="post" action="{{ app_url('/jobs/scrape') }}" class="form-inline">
                         <input type="text" name="selection" value="all" aria-label="抓取范围" />
                         <button class="btn-primary" type="submit">开始抓取</button>
                     </form>
-                    <form method="post" action="/jobs/export" class="form-inline">
+                    <form method="post" action="{{ app_url('/jobs/export') }}" class="form-inline">
                         <input type="text" name="selection" value="all" aria-label="导出范围" />
                         <button class="btn-primary" type="submit">导出 CSV+JSON</button>
                     </form>
-                    <form method="post" action="/jobs/rescrape" class="form-inline">
+                    <form method="post" action="{{ app_url('/jobs/rescrape') }}" class="form-inline">
                         <input type="text" name="selection" value="all" aria-label="补抓范围" />
                         <button class="btn-primary" type="submit">补抓媒体</button>
                     </form>
@@ -946,7 +946,7 @@
                 <div>
                     <p class="hint">账号可见频道：勾选后加入监控。标题包含配置项「账号列表隐藏」中任一子串的会话不会出现在此列表（默认隐藏含「远程-到岗-技术招聘」的群，避免选到自有招聘群）。</p>
                     {% if account_channels %}
-                    <form method="post" action="/channels/add-selected" class="account-pick-form">
+                    <form method="post" action="{{ app_url('/channels/add-selected') }}" class="account-pick-form">
                         <div class="account-pick-toolbar">
                             <button type="button" class="text-btn" id="account-select-all">全选可选项</button>
                             <button type="button" class="text-btn" id="account-select-none">全不选</button>
@@ -988,7 +988,7 @@
         </div>
         <div class="modal-body">
             <p class="hint">保存后建议断开并重新连接 Telegram。</p>
-            <form method="post" action="/config" class="config-form">
+            <form method="post" action="{{ app_url('/config') }}" class="config-form">
                 {% for f in fields %}
                 {% if f.key in binary_env_keys %}
                 <div class="field-row field-row-toggle">
@@ -1037,6 +1037,21 @@
 
     <script src="https://cdn.jsdelivr.net/npm/echarts@5.5.1/dist/echarts.min.js"></script>
     <script>
+        window.__URL_PREFIX__ = {{ url_prefix|tojson }};
+        function appPath(p) {
+            p = p.startsWith("/") ? p : ("/" + p);
+            var pre = window.__URL_PREFIX__ || "";
+            return pre ? (pre + p) : p;
+        }
+        function appHomeWithQuery(tail) {
+            var pre = window.__URL_PREFIX__ || "";
+            var base = pre ? (pre + "/") : "/";
+            base = base.replace(/\/*$/, "/");
+            if (!tail) return base;
+            if (tail.charAt(0) !== "?") tail = "?" + tail;
+            return base + tail;
+        }
+
         function formatInt(n) {
             if (n == null || isNaN(n)) return "—";
             return Number(n).toLocaleString("zh-CN");
@@ -1049,7 +1064,7 @@
 
         async function consoleAuthStatus() {
             try {
-                var r = await fetch("/auth/console/status", { credentials: "same-origin" });
+                var r = await fetch(appPath("/auth/console/status"), { credentials: "same-origin" });
                 if (!r.ok) return false;
                 var j = await r.json();
                 return j.ok === true;
@@ -1086,7 +1101,7 @@
                 }
                 var pw = authPwd ? authPwd.value : "";
                 try {
-                    var res = await fetch("/auth/console/login", {
+                    var res = await fetch(appPath("/auth/console/login"), {
                         method: "POST",
                         headers: { "Content-Type": "application/json" },
                         credentials: "same-origin",
@@ -1102,7 +1117,7 @@
                             pendingOpenDlgId = null;
                         }
                         if (authPwd) authPwd.value = "";
-                        window.location.href = "/" + tail;
+                        window.location.href = appHomeWithQuery(tail);
                     } else {
                         if (authErr) {
                             authErr.textContent = (data && data.error) ? data.error : "验证失败";
@@ -1266,7 +1281,7 @@
             var qs = new URLSearchParams({ days: String(days) });
             if (kw) qs.set("keywords", kw);
             try {
-                var res = await fetch("/api/stats/overview?" + qs.toString());
+                var res = await fetch(appPath("/api/stats/overview") + "?" + qs.toString());
                 if (!res.ok) throw new Error("HTTP " + res.status);
                 var data = await res.json();
                 applyStats(data);
@@ -1307,7 +1322,7 @@
 
         async function refreshStatus() {
             try {
-                var statusResp = await fetch("/api/jobs/status", { credentials: "same-origin" });
+                var statusResp = await fetch(appPath("/api/jobs/status"), { credentials: "same-origin" });
                 if (statusResp.ok) {
                     var status = await statusResp.json();
                     var runningEl = document.getElementById("job-running");
@@ -1355,7 +1370,7 @@
                     }
                 }
 
-                var channelsResp = await fetch("/api/channels/monitored", { credentials: "same-origin" });
+                var channelsResp = await fetch(appPath("/api/channels/monitored"), { credentials: "same-origin" });
                 if (channelsResp.ok) {
                     var payload = await channelsResp.json();
                     var wrap = document.getElementById("monitored-list");