feat(audit): Phase 11 告警操作完整溯源 — alert_operation_log + 歷史回填

統帥指令「所有告警訊息通通寫入資料庫，並記錄相關操作」

變更:
- phase11_alert_operation_log.sql: 新表 (Event Sourcing，不可變)
- phase11b_backfill_alert_operation_log.sql: 歷史回填 654 筆
  - 14 筆 ALERT_RECEIVED (incidents)
  - 265 筆 TELEGRAM_SENT (approval_records)
  - 265 筆 USER_ACTION (approval_records)
  - 110 筆 EXECUTION_COMPLETED (audit_logs)
- db/models.py: AlertOperationLog SQLAlchemy model
- repositories/alert_operation_log_repository.py: append/list_by_incident/get_stats
- webhooks.py: _try_auto_repair_background 寫入 AUTO_REPAIR_TRIGGERED + EXECUTION_COMPLETED + TELEGRAM_RESULT_SENT
- webhooks.py: _push_to_telegram_background 寫入 TELEGRAM_SENT
- telegram.py: handle_callback 寫入 USER_ACTION (approve/reject)

已執行 migration: awoooi_prod@192.168.0.188 ✅

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/db/models.py

@@ -396,6 +396,54 @@ class AutoRepairExecution(Base):
     )
 
 
+# =============================================================================
+# AlertOperationLog - Phase 11 告警操作溯源 (Event Sourcing)
+# 2026-04-08 Claude Code: 統帥指令「所有操作都必須被記錄，寫入資料庫」
+# 不可變 — 只 INSERT，不 UPDATE/DELETE
+# =============================================================================
+
+class AlertOperationLog(Base):
+    """
+    告警操作完整溯源
+
+    Event Sourcing 模式：每個告警生命週期的每個事件都寫一筆。
+    不可變 (Immutable)。
+
+    event_type 值：
+      ALERT_RECEIVED / TELEGRAM_SENT / USER_ACTION /
+      AUTO_REPAIR_TRIGGERED / EXECUTION_STARTED / EXECUTION_COMPLETED /
+      TELEGRAM_RESULT_SENT / RESOLVED / SILENCED / ESCALATED
+    """
+    __tablename__ = "alert_operation_log"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=generate_uuid)
+
+    # 關聯 (允許 NULL，不同事件有不同關聯)
+    incident_id: Mapped[str | None] = mapped_column(String(30), nullable=True, index=True)
+    approval_id: Mapped[str | None] = mapped_column(String(36), nullable=True, index=True)
+    audit_log_id: Mapped[str | None] = mapped_column(String(36), nullable=True)
+    auto_repair_id: Mapped[str | None] = mapped_column(String(36), nullable=True)
+
+    # 事件核心
+    event_type: Mapped[str] = mapped_column(String(50), nullable=False, index=True)
+    actor: Mapped[str | None] = mapped_column(String(100), nullable=True, index=True)
+    action_detail: Mapped[str | None] = mapped_column(String(200), nullable=True)
+
+    # 執行結果 (NULL = 不適用)
+    success: Mapped[bool | None] = mapped_column(nullable=True)
+    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
+
+    # 結構化上下文
+    context: Mapped[dict] = mapped_column(JSON, default=dict, nullable=False)
+
+    # 時間戳 (台北時區，不可變)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=taipei_now)
+
+    __table_args__ = (
+        Index("ix_aol_created_at", "created_at"),
+    )
+
+
 # =============================================================================
 # IncidentRecord - Phase 6.2 Episodic Memory (PostgreSQL)
 # =============================================================================