feat(monitoring): 監控工具區塊 — Grafana/Prometheus/SigNoz/Gitea 狀態

- 新增 GET /api/v1/monitoring/status，asyncio.gather 並行探測四工具
- 前端 MonitoringTools 元件，60s 輪詢顯示狀態/版本/統計
- 新增 monitoringTools i18n key

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/main.py

@@ -57,6 +57,7 @@ from src.api.v1 import (
 from src.api.v1 import (
     signoz_webhook as signoz_webhook_v1,  # Phase 21: SignOz → Telegram (ADR-037)
 )
+from src.api.v1 import monitoring as monitoring_v1  # 2026-04-03: 監控工具狀態
 from src.api.v1 import stats as stats_v1  # Phase 6.5: Statistics Analytics
 from src.api.v1 import telegram as telegram_v1  # Phase 5.4: Telegram Gateway
 from src.api.v1 import terminal as terminal_v1  # Phase 19.1: Omni-Terminal SSE
@@ -402,6 +403,9 @@ app.include_router(
 app.include_router(
     stats_v1.router, prefix="/api/v1", tags=["Statistics"]
 )  # Phase 6.5: Statistics Analytics
+app.include_router(
+    monitoring_v1.router, prefix="/api/v1", tags=["Monitoring"]
+)  # 2026-04-03: 監控工具狀態
 app.include_router(
     github_webhook_v1.router, prefix="/api/v1", tags=["GitHub Webhook"]
 )  # Phase 13.1: GitHub → OpenClaw