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

tests/test_web_observability.py

@@ -6,7 +6,6 @@ import web.routes as routes
 import web.scan_terminal_cache as scan_terminal_cache
 import web.scan_terminal_service as scan_terminal_service
 from web.scan_terminal_cache import scan_terminal_cache_key
-from src.database.db_manager import DBManager
 from src.database.runtime_state import TruthRecordRepository, TrainingFeatureRecordRepository
 
 
@@ -38,7 +37,6 @@ def test_system_status_returns_summary_shape():
     assert payload['probability']['rollout']['decision']['decision'] in {'hold', 'observe', 'promote'}
     assert 'training_data' in payload
     assert 'station_networks' in payload
-    assert 'prewarm' in payload
     assert 'truth_records' in payload['training_data']
     assert 'training_features' in payload['training_data']
     assert 'city_coverage' in payload['training_data']
@@ -46,55 +44,9 @@ def test_system_status_returns_summary_shape():
     assert 'artifacts' in payload['training_data']
     assert 'metar_entries' in payload['cache']
     assert 'nmc_entries' in payload['cache']
-    assert 'runtime' in payload['prewarm']
-    assert 'last_summary_ok' in payload['prewarm']['runtime']
     assert 'cities_count' in payload
 
 
-def test_system_status_reads_shared_prewarm_runtime(monkeypatch):
-    monkeypatch.setenv("POLYWEATHER_DASHBOARD_PREWARM_ENABLED", "true")
-    monkeypatch.setenv("POLYWEATHER_PREWARM_INTERVAL_SEC", "300")
-    monkeypatch.setenv("POLYWEATHER_PREWARM_JITTER_SEC", "20")
-
-    DBManager().set_payment_runtime_state(
-        "dashboard_prewarm",
-        {
-            "cycle_count": 3,
-            "success_count": 3,
-            "failure_count": 0,
-            "last_started_at": "2026-04-08T12:00:00",
-            "last_finished_at": "2026-04-08T12:00:05",
-            "last_duration_sec": 5.0,
-            "last_success": True,
-            "last_http_status": 200,
-            "last_error": None,
-            "last_requested_cities": ["shanghai", "beijing"],
-            "last_requested_city_count": 2,
-            "last_include_detail": True,
-            "last_include_market": True,
-            "last_force_refresh": False,
-            "last_warmed_count": 2,
-            "last_summary_ok": 2,
-            "last_detail_ok": 2,
-            "last_market_ok": 2,
-            "last_failed_count": 0,
-            "last_heartbeat_ts": __import__("time").time(),
-            "writer_mode": "standalone_process",
-            "writer_pid": 12345,
-            "writer_thread_name": "MainThread",
-        },
-    )
-
-    response = client.get('/api/system/status')
-
-    assert response.status_code == 200
-    payload = response.json()
-    assert payload["prewarm"]["enabled"] is True
-    assert payload["prewarm"]["thread_alive"] is True
-    assert payload["prewarm"]["runtime"]["cycle_count"] >= 3
-    assert payload["prewarm"]["runtime"]["last_summary_ok"] == 2
-
-
 def test_metrics_endpoint_returns_prometheus_payload():
     response = client.get('/metrics')
     assert response.status_code == 200