feat(sprint5.1): Data Safety Guardrails 全鏈路整合 (L1-L5)

Layer 0 - K8s RBAC:
  - k8s/rbac/api-velero-reader.yaml: awoooi-executor SA Velero backup reader

Layer 1 - DB Migration (已在 188 執行):
  - M-002: approval_records 新增 approval_level/votes/required_votes
  - M-003: alert_event_type ENUM 新增 8 個值

Layer 2 - IaC:
  - ops/config/service-registry.yaml: 全服務 Stateful 分級清單 (BLOCK/CRITICAL_HITL/STANDARD_HITL/AUTO)

Layer 3 - Python Services:
  - service_registry.py: 讀取 YAML，提供 is_blocked/requires_multisig/get_required_votes
  - velero_client.py: kubectl 查詢 Velero 備份年齡，失敗 fallback 999h
  - preflight_service.py: Pre-flight 安全檢查 (Q2/Q4 決策)

Layer 1-M001 - Playbook model:
  - playbook.py: 新增 requires_approval_level/stateful_targets/requires_pre_backup

Layer 4 - 業務邏輯:
  - alert_operation_log_repository.py: 新增 8 個 event_type (Guardrail/Pre-flight/MultiSig/備份)
  - auto_repair_service.py: 注入 Service Registry Guardrail 檢查 (BLOCK → 直接拒絕)
  - webhooks.py: ALERT_RECEIVED 溯源記錄 + auto_repair flag Q9 + Langfuse trace_id Q10
  - db/models.py: ApprovalRecord 同步 approval_level/votes/required_votes 欄位
  - docker-health-monitor.sh: 純感知層改造（移除所有 docker restart 邏輯）

Layer 5 - Telegram 通知:
  - telegram_gateway.py: T1-T6 六個新通知方法 (Guardrail/Pre-flight/Backup/MultiSig/ChangeApplied)

參考: ADR-062 Data Safety Guardrails, ADR-063 Service Registry IaC

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

apps/api/src/models/playbook.py

@@ -212,6 +212,20 @@ class Playbook(BaseModel):
     tags: list[str] = Field(default_factory=list, description="標籤")
     notes: str | None = Field(None, description="人工補充說明")
 
+    # === Sprint 5.1 資料安全護欄 (2026-04-08 Claude Sonnet 4.6 Asia/Taipei) ===
+    requires_approval_level: str = Field(
+        default="auto",
+        description="auto=直接執行, standard=1票, critical=2票MultiSig（由 Service Registry 決定）",
+    )
+    stateful_targets: list[str] = Field(
+        default_factory=list,
+        description="此 Playbook 操作的 Stateful 服務清單，對應 service-registry.yaml",
+    )
+    requires_pre_backup: bool = Field(
+        default=False,
+        description="執行前是否需要 Pre-flight 備份檢查",
+    )
+
     # === 時間軸 ===
     created_at: datetime = Field(default_factory=now_taipei)
     updated_at: datetime = Field(default_factory=now_taipei)