fix(notifications): 新增後端 /api/v1/notifications/channels 路由

前端 /notifications 頁面呼叫此 endpoint 但後端不存在 (404)
新增 notifications.py：回傳 4 個真實頻道狀態
- Telegram OpenClaw Bot (BOT_TOKEN 設定檢查)
- Telegram Nemotron Bot (BOT_TOKEN 設定檢查)
- SSE Web Stream (永遠 active)
- Redis Stream awoooi:signals (ping 檢查)

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

apps/api/src/api/v1/notifications.py

@@ -0,0 +1,85 @@
+"""
+通知頻道狀態 API
+================
+GET /api/v1/notifications/channels — 回傳所有通知頻道的真實狀態
+
+頻道:
+  1. Telegram (OpenClaw bot)   — 檢查 BOT_TOKEN 是否設定
+  2. Telegram (AWOOOI bot)     — 檢查 AWOOOI_TG_BOT_TOKEN 是否設定
+  3. SSE (Server-Sent Events)  — 永遠 active (HTTP endpoint 存在)
+  4. Redis Stream              — 檢查 Redis 連線狀態
+
+建立時間: 2026-04-10 (台北時區)
+建立者: Claude Code (Sprint 5R B5 修復)
+"""
+
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+from src.core.config import settings
+
+router = APIRouter()
+
+
+@router.get("/notifications/channels")
+async def list_notification_channels() -> list[dict]:
+    """
+    回傳所有通知頻道的真實設定狀態。
+    不做網路探測 (避免延遲)，只檢查 config 是否完整。
+    """
+    channels: list[dict] = []
+
+    # 1. OpenClaw Telegram Bot (告警 + 審核按鈕)
+    openclaw_ok = bool(
+        getattr(settings, "OPENCLAW_TG_BOT_TOKEN", None)
+        or getattr(settings, "OPENCLAW_BOT_TOKEN", None)
+    )
+    channels.append({
+        "name": "Telegram (OpenClaw Bot)",
+        "type": "telegram",
+        "status": "active" if openclaw_ok else "error",
+        "description": "告警通知 + HITL 審核按鈕",
+        "features": ["alerts", "approvals", "auto_repair"],
+    })
+
+    # 2. Nemotron Telegram Bot (AI 回覆)
+    nemotron_ok = bool(getattr(settings, "NEMOTRON_BOT_TOKEN", None))
+    channels.append({
+        "name": "Telegram (Nemotron Bot)",
+        "type": "telegram",
+        "status": "active" if nemotron_ok else "error",
+        "description": "AI 分析結果回覆",
+        "features": ["ai_responses", "rag_query"],
+    })
+
+    # 3. SSE (Server-Sent Events) — 前端實時推播
+    channels.append({
+        "name": "SSE (Web Stream)",
+        "type": "sse",
+        "status": "active",
+        "description": "前端儀表板實時數據推播",
+        "features": ["dashboard", "approvals", "incidents"],
+        "endpoint": "/api/v1/dashboard/stream",
+    })
+
+    # 4. Redis Stream — 感測器信號通道
+    try:
+        import redis.asyncio as aioredis
+        r = aioredis.from_url(settings.REDIS_URL, socket_connect_timeout=1)
+        await r.ping()
+        await r.aclose()
+        redis_status = "active"
+    except Exception:
+        redis_status = "error"
+
+    channels.append({
+        "name": "Redis Stream (awoooi:signals)",
+        "type": "stream",
+        "status": redis_status,
+        "description": "Sensor Agent 信號通道",
+        "features": ["sensor_signals", "dedup"],
+        "stream_key": "awoooi:signals",
+    })
+
+    return channels

apps/api/src/main.py

@@ -62,6 +62,7 @@ from src.api.v1 import (
 from src.api.v1 import drift as drift_v1  # Phase 25 P2: Config Drift Detection
 from src.api.v1 import rag as rag_v1  # Phase 33 ADR-067: RAG 知識庫
 from src.api.v1 import monitoring as monitoring_v1  # 2026-04-03: 監控工具狀態
+from src.api.v1 import notifications as notifications_v1  # 2026-04-10: 通知頻道狀態
 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
@@ -506,6 +507,9 @@ app.include_router(
 app.include_router(
     signoz_webhook_v1.router, prefix="/api/v1", tags=["SignOz Webhook"]
 )  # Phase 21: SignOz → Telegram (ADR-037)
+app.include_router(
+    notifications_v1.router, prefix="/api/v1", tags=["Notifications"]
+)  # 2026-04-10: 通知頻道狀態
 app.include_router(
     terminal_v1.router, prefix="/api/v1", tags=["Omni-Terminal"]
 )  # Phase 19.1: Omni-Terminal SSE