fix(api): Incident-Approval 同步 (活躍事件修復)

問題: Alertmanager webhook 只創建 Approval，沒有創建對應 Incident
      導致「活躍事件」顯示 0 筆，但右側有待簽核卡片

修復:
- 新增 create_incident_for_approval() 函數
- Approval 創建後同步創建 Incident
- 存入 Redis (incident:INC-*) 7 天 TTL
- 支援 LLM 成功路徑和 fallback 路徑

遵循 feedback_incident_approval_sync.md 鐵律

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/api/v1/webhooks.py

@@ -42,6 +42,7 @@ from src.models.approval import (
     DryRunCheck,
     RiskLevel,
 )
+from src.models.incident import Incident, IncidentStatus, Severity, Signal
 from src.services.approval_db import get_approval_service
 
 # Phase 5: OpenClaw AI Engine
@@ -54,6 +55,87 @@ router = APIRouter(prefix="/webhooks", tags=["Webhooks"])
 logger = get_logger("awoooi.webhooks")
 
 
+# =============================================================================
+# Incident-Approval 同步 (feedback_incident_approval_sync.md 鐵律)
+# =============================================================================
+
+# 風險等級 → 事件嚴重度映射
+RISK_TO_SEVERITY = {
+    "critical": Severity.P0,
+    "high": Severity.P1,
+    "medium": Severity.P2,
+    "low": Severity.P3,
+}
+
+# Incident TTL: 7 天 (秒)
+INCIDENT_TTL_SECONDS = 7 * 24 * 60 * 60
+
+
+async def create_incident_for_approval(
+    approval_id: str,
+    risk_level: str,
+    target_resource: str,
+    namespace: str,
+    alert_type: str,
+    message: str,
+    source: str = "alertmanager",
+) -> str:
+    """
+    為 Approval 創建對應的 Incident (活躍事件同步)
+
+    設計原則:
+    - Approval 和 Incident 必須同時存在
+    - Incident 存入 Redis (Working Memory)
+    - 7 天 TTL 自動過期
+
+    Returns:
+        str: Incident ID
+    """
+    from uuid import UUID
+
+    redis_client = get_redis()
+
+    # 映射嚴重度
+    severity = RISK_TO_SEVERITY.get(risk_level.lower(), Severity.P2)
+
+    # 建立 Signal (原始告警)
+    signal = Signal(
+        alert_name=alert_type,
+        severity=severity,
+        source=source,
+        fired_at=datetime.now(UTC),
+        labels={"namespace": namespace, "resource": target_resource},
+        annotations={"message": message},
+    )
+
+    # 建立 Incident
+    incident = Incident(
+        status=IncidentStatus.INVESTIGATING,
+        severity=severity,
+        signals=[signal],
+        affected_services=[target_resource],
+        proposal_ids=[UUID(approval_id)],
+    )
+
+    # 存入 Redis (Working Memory)
+    key = f"incident:{incident.incident_id}"
+    await redis_client.set(
+        key,
+        incident.model_dump_json(),
+        ex=INCIDENT_TTL_SECONDS,
+    )
+
+    logger.info(
+        "incident_created_for_approval",
+        incident_id=incident.incident_id,
+        approval_id=approval_id,
+        severity=severity.value,
+        target=target_resource,
+    )
+
+    return incident.incident_id
+
+
 # =============================================================================
 # Phase 5: Telegram 背景推送任務 (非阻塞)
 # =============================================================================
@@ -1236,6 +1318,19 @@ async def alertmanager_webhook(
                 fingerprint=fingerprint,
             )
 
+            # ================================================================
+            # Incident-Approval 同步 (鐵律: 必須同時創建)
+            # ================================================================
+            await create_incident_for_approval(
+                approval_id=str(approval.id),
+                risk_level=risk_level.value,
+                target_resource=target_resource,
+                namespace=namespace,
+                alert_type=alert_type,
+                message=message,
+                source="alertmanager",
+            )
+
             root_cause = analysis_result.description or message
             estimated_downtime = blast.estimated_downtime if blast else "~30s"
             primary_responsibility = analysis_result.primary_responsibility or "COLLAB"
@@ -1294,6 +1389,19 @@ async def alertmanager_webhook(
                 fingerprint=fingerprint,
             )
 
+            # ================================================================
+            # Incident-Approval 同步 (鐵律: 即使 LLM 失敗也必須創建)
+            # ================================================================
+            await create_incident_for_approval(
+                approval_id=str(approval.id),
+                risk_level="medium",
+                target_resource=target_resource,
+                namespace=namespace,
+                alert_type=alert_type,
+                message=message,
+                source="alertmanager",
+            )
+
             background_tasks.add_task(
                 _push_to_telegram_background,
                 approval_id=str(approval.id),