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

docker-compose.yml

@@ -34,14 +34,3 @@ services:
     # UID/GID are mainly useful on Linux hosts to avoid root-owned output files.
     user: "${UID:-1000}:${GID:-1000}"
 
-  polyweather_prewarm:
-    <<: *polyweather-base
-    container_name: polyweather_prewarm
-    restart: unless-stopped
-    profiles: ["workers"]
-    command: python scripts/prewarm_dashboard_worker.py --include-detail --include-market
-    volumes:
-      - ${POLYWEATHER_RUNTIME_DATA_DIR:-/var/lib/polyweather}:/var/lib/polyweather
-      - ${POLYWEATHER_RUNTIME_DATA_DIR:-/var/lib/polyweather}:/app/data
-    user: "${UID:-1000}:${GID:-1000}"
-