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/services/huya_service.py

@@ -313,6 +313,40 @@ def ensure_huya_config(db: Session) -> HuyaConfig:
     return config
 
 
+HUYA_ACTIVE_TASK_STATUSES = ("planned", "pending", "running")
+HUYA_STALE_TASK_STATUSES = ("pending", "running")
+
+
+def cleanup_orphan_huya_tasks(
+    db: Session,
+    *,
+    active_batch_ids: set[str] | None = None,
+    batch_id: str | None = None,
+    statuses: tuple[str, ...] = HUYA_ACTIVE_TASK_STATUSES,
+    message: str = "任务已中断（服务重启或批次丢失）",
+) -> int:
+    """清理没有执行器接管的虎牙任务，避免前端被历史 running 状态锁死。"""
+    query = db.query(HuyaTask).filter(HuyaTask.status.in_(statuses))
+    if batch_id:
+        query = query.filter(HuyaTask.batch_id == batch_id)
+    elif active_batch_ids is not None:
+        if active_batch_ids:
+            query = query.filter(~HuyaTask.batch_id.in_(list(active_batch_ids)))
+    # active_batch_ids is None 且未指定 batch_id：清理全部匹配状态
+
+    tasks = query.all()
+    if not tasks:
+        return 0
+
+    now = datetime.now(timezone.utc)
+    for task in tasks:
+        task.status = "stopped"
+        task.message = message
+        task.finished_at = now
+    db.commit()
+    return len(tasks)
+
+
 def create_planned_tasks(
     db: Session,
     account_ids: list[int],