修复虎牙任务台卡死与轮询过重，并调整默认端口

默认端口改为后端 8800 / 前端 5174，避免多项目冲突。
清理无执行器的残留 running 任务，支持停止无效批次；绑定二维码结果页不再被假活跃批次锁死。
任务列表默认剥离 base64 小程序码，按需拉取详情，空闲轮询降频，显著降低 tasks 请求体积。

web/backend/routers/huya.py

@@ -51,6 +51,7 @@ from ..services.huya_service import (
     HUYA_CONFIG_FIELDS,
     SUPPORTED_TASK_TYPES,
     apply_huya_config_defaults,
+    cleanup_orphan_huya_tasks,
     create_planned_tasks,
     ensure_huya_config,
     huya_config_value,
@@ -133,7 +134,23 @@ def _account_out(account: HuyaAccount, include_cookie: bool = True) -> HuyaAccou
     )
 
 
-def _task_out(task: HuyaTask) -> HuyaTaskOut:
+def _sanitize_task_result(result: dict | None, *, include_images: bool = False) -> dict | None:
+    """列表接口默认剥离 base64 图片，避免轮询每次传 1MB+ 数据。"""
+    if not isinstance(result, dict):
+        return result
+
+    data = dict(result)
+    image = data.get("mini_qrcode_image")
+    if isinstance(image, str) and image:
+        data["has_mini_qrcode"] = True
+        if not include_images:
+            data.pop("mini_qrcode_image", None)
+    elif data.get("has_mini_qrcode"):
+        data["has_mini_qrcode"] = True
+    return data
+
+
+def _task_out(task: HuyaTask, *, include_images: bool = False) -> HuyaTaskOut:
     account = task.account
     return HuyaTaskOut(
         id=task.id,
@@ -144,7 +161,7 @@ def _task_out(task: HuyaTask) -> HuyaTaskOut:
         task_type=task.task_type,
         status=task.status or "",
         message=task.message or "",
-        result=task.result,
+        result=_sanitize_task_result(task.result if isinstance(task.result, dict) else None, include_images=include_images),
         created_by=task.created_by,
         created_at=task.created_at,
         finished_at=task.finished_at,
@@ -952,6 +969,16 @@ async def create_task_batch(
     """创建虎牙任务记录并启动后台执行器。"""
     if not req.account_ids:
         raise HTTPException(status_code=400, detail="请选择虎牙账号")
+
+    # 先清掉没有执行器的历史 running/pending，避免前端被假活跃批次锁死。
+    # 不清理 planned：避免与刚创建的新任务产生竞态。
+    cleanup_orphan_huya_tasks(
+        db,
+        active_batch_ids=huya_batch_registry.active_ids(),
+        statuses=("pending", "running"),
+        message="任务已中断（无执行器接管）",
+    )
+
     try:
         batch_id, count = create_planned_tasks(
             db,
@@ -988,27 +1015,71 @@ async def create_task_batch(
 @router.get("/tasks", response_model=list[HuyaTaskOut])
 def list_tasks(
     batch_id: str | None = None,
+    include_images: bool = Query(False, description="是否返回 base64 小程序码（默认否，轮询请保持 false）"),
     db: Session = Depends(get_db),
     current: User = Depends(require_permission("huya:task")),
 ):
     """查看虎牙任务记录。"""
+    cleanup_orphan_huya_tasks(
+        db,
+        active_batch_ids=huya_batch_registry.active_ids(),
+        statuses=("pending", "running"),
+        message="任务已中断（无执行器接管）",
+    )
     query = db.query(HuyaTask).options(joinedload(HuyaTask.account))
     if batch_id:
         query = query.filter(HuyaTask.batch_id == batch_id)
     tasks = query.order_by(HuyaTask.id.desc()).limit(300).all()
-    return [_task_out(task) for task in tasks]
+    return [_task_out(task, include_images=include_images) for task in tasks]
+
+
+@router.get("/tasks/{task_id}", response_model=HuyaTaskOut)
+def get_task(
+    task_id: int,
+    db: Session = Depends(get_db),
+    current: User = Depends(require_permission("huya:task")),
+):
+    """获取单条虎牙任务详情（含二维码图片）。"""
+    task = (
+        db.query(HuyaTask)
+        .options(joinedload(HuyaTask.account))
+        .filter(HuyaTask.id == task_id)
+        .first()
+    )
+    if not task:
+        raise HTTPException(status_code=404, detail="任务不存在")
+    return _task_out(task, include_images=True)
 
 
 @router.post("/stop/{batch_id}")
 def stop_batch(
     batch_id: str,
+    db: Session = Depends(get_db),
     current: User = Depends(require_permission("huya:task")),
 ):
     """停止正在运行的虎牙批次。"""
     batch = huya_batch_registry.get(batch_id)
     if batch:
+        if batch.get("finished"):
+            huya_batch_registry.pop(batch_id)
+            cleaned = cleanup_orphan_huya_tasks(
+                db,
+                batch_id=batch_id,
+                message="批次已结束",
+            )
+            if cleaned:
+                return {"message": f"批次已结束，已清理 {cleaned} 个残留任务", "success": True}
+            raise HTTPException(status_code=404, detail="批次已结束")
         batch["runner"].stop()
         return {"message": "已发送停止信号", "success": True}
+
+    cleaned = cleanup_orphan_huya_tasks(
+        db,
+        batch_id=batch_id,
+        message="任务已停止（批次不存在）",
+    )
+    if cleaned:
+        return {"message": f"已清理 {cleaned} 个残留任务", "success": True}
     raise HTTPException(status_code=404, detail="批次不存在或已结束")
 
 
@@ -1042,4 +1113,6 @@ async def ws_huya_logs(websocket: WebSocket, batch_id: str):
     except WebSocketDisconnect:
         pass
     finally:
-        huya_batch_registry.pop(batch_id)
+        latest = huya_batch_registry.get(batch_id)
+        if latest and latest.get("finished"):
+            huya_batch_registry.pop(batch_id)