完全移除预热（prewarm）功能

- 删除 src/utils/prewarm_dashboard.py
- 删除 scripts/prewarm_dashboard_cache.py、prewarm_dashboard_worker.py
- docker-compose.yml 移除 polyweather_prewarm 服务
- runtime_coordinator.py 移除预热循环启动逻辑
- web/core.py 移除 prewarm status 上报
- web/routers/system.py 移除 /api/system/prewarm 端点
- web/services/system_api.py 移除 run_system_prewarm
- city_runtime.py DEFAULT_PREWARM_CITIES 改名为 DEFAULT_STATUS_CITIES
- 清理 env.example、测试、VPS .env 中的预热配置

src/bot/runtime_coordinator.py

@@ -84,7 +84,6 @@ class StartupCoordinator:
     def start_all(self) -> RuntimeStatus:
         loops = [
             self._start_airport_high_freq_loop(),
-            self._start_dashboard_prewarm_loop(),
             self._start_polygon_wallet_loop(),
             self._start_polymarket_wallet_activity_loop(),
             self._start_weekly_reward_loop(),
@@ -175,32 +174,6 @@ class StartupCoordinator:
             ),
         )
 
-    def _start_dashboard_prewarm_loop(self) -> LoopStatus:
-        enabled = _env_bool("POLYWEATHER_DASHBOARD_PREWARM_ENABLED", False)
-        interval = max(30, _env_int("POLYWEATHER_PREWARM_INTERVAL_SEC", 300))
-        jitter = max(0, _env_int("POLYWEATHER_PREWARM_JITTER_SEC", 20))
-        cities_count = _parse_csv_count(os.getenv("POLYWEATHER_PREWARM_CITIES")) or 14
-        details = {
-            "interval_sec": interval,
-            "jitter_sec": jitter,
-            "cities_count": cities_count,
-            "include_detail": _env_bool("POLYWEATHER_PREWARM_INCLUDE_DETAIL", True),
-            "include_market": _env_bool("POLYWEATHER_PREWARM_INCLUDE_MARKET", True),
-            "force_refresh": _env_bool("POLYWEATHER_PREWARM_FORCE_REFRESH", False),
-            "base_url": str(os.getenv("POLYWEATHER_BACKEND_URL") or "http://127.0.0.1:8000").strip(),
-        }
-        validation_error = None
-        if not str(os.getenv("POLYWEATHER_BACKEND_ENTITLEMENT_TOKEN") or "").strip():
-            validation_error = "missing_POLYWEATHER_BACKEND_ENTITLEMENT_TOKEN"
-        return self._start_with_validation(
-            key="dashboard_prewarm",
-            label="站点面板预热",
-            configured_enabled=enabled,
-            details=details,
-            validation_error=validation_error,
-            starter=lambda: import_module("src.utils.prewarm_dashboard").start_prewarm_worker_thread(),
-        )
-
     def _start_polygon_wallet_loop(self) -> LoopStatus:
         enabled = _env_bool("POLYGON_WALLET_WATCH_ENABLED", False)
         chat_ids = get_telegram_chat_ids_from_env()