fix(alerts): surface legacy hitl backlog

apps/api/src/models/approval.py

@@ -167,6 +167,8 @@ class ApprovalRequest(ApprovalRequestBase):
     fingerprint: str | None = Field(default=None, description="告警指紋 Hash")
     hit_count: int = Field(default=1, description="聚合觸發次數")
     last_seen_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), description="最後觸發時間")
+    telegram_message_id: int | None = Field(default=None, description="Telegram approval card message ID")
+    telegram_chat_id: int | None = Field(default=None, description="Telegram chat ID for the approval card")
     # 2026-04-14 Claude Sonnet 4.6: incident_id 已移至 Base（避免 ApprovalRequestCreate 缺欄位）
 
     @property
@@ -216,6 +218,10 @@ class ApprovalRequestResponse(BaseModel):
     hit_count: int = 1
     last_seen_at: datetime | None = None
     # Phase 6.5: Incident 關聯 (用於簽核後更新 Incident 狀態)
+    incident_id: str | None = None
+    matched_playbook_id: str | None = None
+    telegram_message_id: int | None = None
+    telegram_chat_id: int | None = None
     metadata: dict | None = None
 
     @classmethod
@@ -241,6 +247,10 @@ class ApprovalRequestResponse(BaseModel):
             hit_count=approval.hit_count,
             last_seen_at=approval.last_seen_at,
             # Phase 6.5
+            incident_id=approval.incident_id,
+            matched_playbook_id=approval.matched_playbook_id,
+            telegram_message_id=approval.telegram_message_id,
+            telegram_chat_id=approval.telegram_chat_id,
             metadata=approval.metadata,
         )