fix(infra-alert): Nemotron 異常告警套用標準模板 + 真正自動修復

1. 新增 InfraAlertMessage dataclass — 基礎設施異常的標準告警格式
   (之前 Nemotron 告警是硬編碼文字，不走任何模板)

2. 偵測 Nemotron 異常時自動執行修復:
   kubectl set env ENABLE_NEMOTRON_COLLABORATION=false
   (之前只是把指令印在訊息裡，從未執行)

3. 告警顯示自動修復結果 (✅ 已自動修復 / ❌ 失敗)

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

apps/api/src/services/telegram_gateway.py

@@ -990,6 +990,38 @@ class WeeklyReportMessage:
         return message[:900]
 
 
+@dataclass
+class InfraAlertMessage:
+    """
+    基礎設施異常告警訊息 (INFRA_ALERT)
+
+    2026-04-03 ogt: 新增 — 補足 Nemotron/NIM 等基礎設施異常的標準告警格式
+    用途: 非 incident 型的系統元件異常通知 (AI provider, DB, 外部 API 等)
+    按鈕: 無 (資訊型告警)
+    """
+    component: str          # 元件名稱 (e.g., "Nemotron NIM")
+    status: str             # 狀態描述 (e.g., "⚠️ 超時 (>10s)")
+    impact: str             # 影響說明
+    auto_fixed: bool = False        # 是否已自動修復
+    fix_action: str = ""            # 執行的修復動作
+
+    def format(self) -> str:
+        """格式化為 Telegram HTML"""
+        fix_block = ""
+        if self.auto_fixed:
+            fix_block = f"━━━━━━━━━━━━━━━━━━━\n✅ <b>已自動修復</b>\n└ {html.escape(self.fix_action[:100])}\n"
+        else:
+            fix_block = f"━━━━━━━━━━━━━━━━━━━\n❌ <b>自動修復失敗</b>\n└ {html.escape(self.fix_action[:100] or '無可用修復方案')}\n"
+
+        return (
+            f"🚨 <b>基礎設施異常</b>\n"
+            f"━━━━━━━━━━━━━━━━━━━\n"
+            f"⚙️ <b>{html.escape(self.component)}</b>: {html.escape(self.status)}\n"
+            f"📛 影響: {html.escape(self.impact[:150])}\n"
+            f"{fix_block}"
+        )[:900]
+
+
 # =============================================================================
 # Risk Level Emoji Mapping
 # =============================================================================
@@ -2992,15 +3024,37 @@ class TelegramGateway:
             await self.send_notification(text)
             self._last_message_time = datetime.now(UTC)
 
-            # Nemotron 異常時額外發告警
+            # Nemotron 異常時：自動修復 + 標準格式告警
             if not nemo_ok:
-                await self.send_notification(
-                    f"🚨 <b>Nemotron 異常告警</b>\n\n"
-                    f"NVIDIA NIM API 不可用: <code>{nemo_status}</code>\n"
-                    f"影響: 所有 incident 的 Nemotron Tool Calling 將 100% 超時\n"
-                    f"緩解: <code>kubectl set env deployment/awoooi-api ENABLE_NEMOTRON_COLLABORATION=false -n awoooi-prod</code>"
+                fix_action = "kubectl set env deployment/awoooi-api ENABLE_NEMOTRON_COLLABORATION=false -n awoooi-prod"
+                auto_fixed = False
+
+                # 自動修復: 關閉 Nemotron 協作避免每個 incident 白等 30s
+                try:
+                    import asyncio
+                    proc = await asyncio.create_subprocess_exec(
+                        "kubectl", "set", "env", "deployment/awoooi-api",
+                        "ENABLE_NEMOTRON_COLLABORATION=false",
+                        "-n", "awoooi-prod",
+                        stdout=asyncio.subprocess.PIPE,
+                        stderr=asyncio.subprocess.PIPE,
+                    )
+                    _, stderr = await asyncio.wait_for(proc.communicate(), timeout=15.0)
+                    auto_fixed = proc.returncode == 0
+                    if not auto_fixed:
+                        logger.error("nemotron_auto_fix_failed", stderr=stderr.decode()[:100])
+                except Exception as fix_err:
+                    logger.error("nemotron_auto_fix_error", error=str(fix_err))
+
+                alert = InfraAlertMessage(
+                    component="Nemotron NIM (NVIDIA API)",
+                    status=nemo_status,
+                    impact="所有 incident Nemotron Tool Calling 將 100% 超時",
+                    auto_fixed=auto_fixed,
+                    fix_action=fix_action,
                 )
-                logger.error("nemotron_health_alert_sent", status=nemo_status)
+                await self.send_notification(alert.format(), parse_mode="HTML")
+                logger.error("nemotron_health_alert_sent", status=nemo_status, auto_fixed=auto_fixed)
 
             logger.info("telegram_heartbeat_sent", nemotron_ok=nemo_ok)
             return True