清理已移除服务的残留环境变量和测试引用

- .env.example：移除 PROMETHEUS/ALERTMANAGER/GRAFANA/ALERT_RELAY 端口配置
- .env.example：移除 TELEGRAM_ALERT_* 市场提醒配置
- test_bot_runtime_coordinator：移除 trade_alert_push 断言

.env.example

@@ -18,12 +18,6 @@ OPEN_METEO_DISK_CACHE_PATH=/var/lib/polyweather/open_meteo_cache.json
 UID=1000
 GID=1000
 POLYWEATHER_STATE_STORAGE_MODE=sqlite
-POLYWEATHER_PROMETHEUS_PORT=9090
-POLYWEATHER_ALERTMANAGER_PORT=9093
-POLYWEATHER_ALERT_RELAY_PORT=9099
-POLYWEATHER_GRAFANA_PORT=3001
-POLYWEATHER_GRAFANA_ADMIN_USER=admin
-POLYWEATHER_GRAFANA_ADMIN_PASSWORD=polyweather
 # Backend CORS allowlist. Add your Vercel production/preview domains when
 # NEXT_PUBLIC_POLYWEATHER_API_BASE_URL points browsers directly at this backend.
 WEB_CORS_ORIGINS=http://localhost:3000,http://127.0.0.1:3000,https://polyweather-pro.vercel.app
@@ -94,14 +88,8 @@ SUPABASE_SUB_CACHE_TTL_SEC=60
 POLYWEATHER_BACKEND_ENTITLEMENT_TOKEN=
 
 ########################################
-# 5) Alerts / operations
+# 5) Operations
 ########################################
-TELEGRAM_ALERT_PUSH_ENABLED=true
-TELEGRAM_ALERT_PUSH_INTERVAL_SEC=300
-TELEGRAM_ALERT_PUSH_COOLDOWN_SEC=1800
-TELEGRAM_ALERT_MIN_TRIGGER_COUNT=2
-TELEGRAM_ALERT_MIN_SEVERITY=medium
-TELEGRAM_ALERT_CITIES=ankara,london,paris,seoul,hong kong,shanghai,singapore,tokyo,tel aviv,toronto,buenos aires,wellington,new york,chicago,dallas,miami,atlanta,seattle,lucknow,sao paulo,munich
 POLYWEATHER_MONITORING_ALERT_CHAT_IDS=
 
 ########################################