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

tests/test_bot_runtime_coordinator.py

@@ -6,7 +6,6 @@ class DummyBot:
 
 
 def test_startup_coordinator_respects_disable_flags(monkeypatch):
-    monkeypatch.setenv("TELEGRAM_ALERT_PUSH_ENABLED", "false")
     monkeypatch.setenv("POLYGON_WALLET_WATCH_ENABLED", "false")
     monkeypatch.setenv("POLYMARKET_WALLET_ACTIVITY_ENABLED", "false")
     monkeypatch.delenv("TELEGRAM_CHAT_ID", raising=False)
@@ -21,9 +20,6 @@ def test_startup_coordinator_respects_disable_flags(monkeypatch):
     runtime = coordinator.start_all()
     loop_map = runtime.loop_map()
 
-    assert loop_map["trade_alert_push"].configured_enabled is False
-    assert loop_map["trade_alert_push"].started is False
-    assert loop_map["trade_alert_push"].reason == "disabled_by_env"
     assert loop_map["polygon_wallet_watch"].reason == "disabled_by_env"
     assert loop_map["polymarket_wallet_activity"].reason == "retired_replaced_by_market_monitor"