fix(chat+nim): 修復首席架構師 Review I1-I4 + S3 四項重要問題

I1: chat_manager._call_openclaw timeout=30.0 → 讀 settings.OPENCLAW_TIMEOUT
I2: nvidia_provider.py stale comment "45" → "55" 對齊 ConfigMap
I3: asyncio.shield 移除 — shield 超時後 task 繼續跑但無人等待 (silent leak)
I4: ChatManager.__init__ 移除 repo 實例 (leWOOOgo 禁 Service 持有 repository)
S3: _check_nemotron_health probe 10s → 25s + /v1/models 輕量端點

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

apps/api/src/services/chat_manager.py

@@ -41,15 +41,16 @@ class ChatManager:
     """AWOOOI 雙 AI 對話管理器"""
 
     def __init__(self):
-        self.k8s = get_k8s_repository()
-        self.incidents = get_incident_repository()
+        pass  # 2026-04-03 ogt: 移除 repo 實例化，leWOOOgo 規範禁止 Service 持有 repository
 
     async def get_system_context(self) -> str:
         """收集系統即時上下文"""
         now = now_taipei()
+        k8s = get_k8s_repository()
+        incidents = get_incident_repository()
 
         try:
-            k8s_status = await self.k8s.get_pod_status_summary(namespace="awoooi-prod")
+            k8s_status = await k8s.get_pod_status_summary(namespace="awoooi-prod")
             cluster_info = f"Cluster: {k8s_status['running']}/{k8s_status['total']} Pods Running"
             if k8s_status.get('problem_pods'):
                 cluster_info += f", {len(k8s_status['problem_pods'])} 異常"
@@ -57,7 +58,7 @@ class ChatManager:
             cluster_info = "Cluster: 無法取得狀態"
 
         try:
-            active_incidents = await self.incidents.get_active()
+            active_incidents = await incidents.get_active()
             if active_incidents:
                 lines = [f"- {inc.incident_id}: {inc.status.value} (SEV {inc.severity.value})"
                          for inc in active_incidents[:3]]
@@ -84,9 +85,10 @@ class ChatManager:
         settings = get_settings()
 
         openclaw_url = getattr(settings, 'OPENCLAW_URL', 'http://192.168.0.188:8088')
+        openclaw_timeout = float(getattr(settings, 'OPENCLAW_TIMEOUT', 30.0))
         try:
             # OpenClaw 沒有通用 chat endpoint，用 analyze/incident 傳入對話內容
-            async with httpx.AsyncClient(timeout=30.0) as client:
+            async with httpx.AsyncClient(timeout=openclaw_timeout) as client:
                 resp = await client.post(
                     f"{openclaw_url}/api/v1/analyze/incident",
                     json={
@@ -167,8 +169,9 @@ class ChatManager:
         )
 
         # OpenClaw 最多等 40s（含 context 取得時間），NemoClaw 最多等 60s
+        # 2026-04-03 ogt: 移除 asyncio.shield — shield 會在超時後讓 task 繼續跑但無人等待，造成 silent leak
         try:
-            openclaw_raw = await asyncio.wait_for(asyncio.shield(openclaw_task), timeout=40.0)
+            openclaw_raw = await asyncio.wait_for(openclaw_task, timeout=40.0)
         except asyncio.TimeoutError:
             openclaw_raw = None