fix(flywheel): 修補剩餘 P0/P1 缺陷

- CRITICAL-1: TYPE-1 path approval_id=str(alert_id) → uuid.uuid4()，
  避免 UUID(approval_id) 拋 ValueError 導致所有 Heartbeat/Info 告警崩潰
- CRITICAL-2: asyncio.create_task() 結果存入 _exec_task 並加 done_callback，
  防止 GC 在執行中途回收任務
- FORMAT: _push_to_telegram_background 新增 notification_type + diff_summary 參數，
  TYPE-4D → send_drift_card()，其他 → send_approval_card()（修正 ConfigDrift 顯示錯誤卡片）
- 傳遞 notification_type 至 Alertmanager 兩個呼叫點

ADR-073 四斷點修補最終收尾

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

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

@@ -24,6 +24,7 @@ Endpoints:
 
 import hashlib
 import hmac
+import uuid
 from typing import Literal
 
 from fastapi import APIRouter, BackgroundTasks, Header, HTTPException, Request, status
@@ -303,12 +304,16 @@ async def _push_to_telegram_background(
     ai_provider: str = "",
     # 2026-04-08 ogt: 補傳 incident_id 以啟用詳情/重診/歷史按鈕
     incident_id: str = "",
+    # ADR-073 Fix: 傳入 notification_type 以正確路由 TYPE-4D Config Drift 卡片
+    notification_type: str = "",
+    diff_summary: str = "",
 ) -> None:
     """
     背景任務: 推送待簽核卡片到 Telegram (v7.0 含 SignOz 整合)
 
     使用 BackgroundTasks 執行，絕不阻塞 Webhook 回應。
     任何 Telegram API 錯誤都會被捕捉並記錄，不影響主流程。
+    TYPE-4D Config Drift → send_drift_card(); 其他 → send_approval_card()
     """
     try:
         gateway = get_telegram_gateway()
@@ -322,13 +327,28 @@ async def _push_to_telegram_background(
             )
             return
 
+        # TYPE-4D: Config Drift 使用專屬卡片 (send_drift_card)
+        # ADR-071-F: [查看Diff][採納變更][回滾][忽略] 四鍵格式
+        if notification_type == "TYPE-4D":
+            await gateway.send_drift_card(
+                incident_id=incident_id,
+                approval_id=approval_id,
+                resource_name=resource_name[:50],
+                diff_summary=diff_summary or root_cause,
+                detected_at="",
+            )
+            logger.info(
+                "telegram_push_success_type4d",
+                approval_id=approval_id,
+                incident_id=incident_id,
+            )
+            return
+
         # 如果是收斂告警，在訊息中加入聚合次數
         root_cause_with_count = root_cause
         if hit_count > 1:
             root_cause_with_count = f"[x{hit_count}] {root_cause}"
 
-        # TODO(2026-04-05): Alertmanager 路徑透過 Approval 建立，尚無 incident_id
-        # 待 Approval→Incident 關聯建立後，補傳 incident_id 以啟用 detail/reanalyze/history 按鈕
         await gateway.send_approval_card(
             approval_id=approval_id,
             risk_level=risk_level,
@@ -930,6 +950,7 @@ async def receive_alert(
             ai_provider=ai_provider,
             # 2026-04-08 ogt: 補傳 incident_id 以啟用詳情/重診/歷史按鈕
             incident_id="",  # /alerts 路徑尚無 incident，detail/reanalyze/history 按鈕不顯示
+            # /alerts 路徑沒有 notification_type（非 Alertmanager 路徑），不需 TYPE-4D routing
         )
 
         return AlertResponse(
@@ -1242,7 +1263,7 @@ async def alertmanager_webhook(
         # ==========================================================================
         if notification_type == "TYPE-1":
             _info_incident_id = await create_incident_for_approval(
-                approval_id=str(alert_id),  # 純資訊無 approval，用 alert_id 佔位
+                approval_id=str(uuid.uuid4()),  # 純資訊無 approval，UUID 佔位避免 ValueError
                 risk_level="low",
                 target_resource=target_resource,
                 namespace=namespace,
@@ -1433,6 +1454,8 @@ async def alertmanager_webhook(
                 ai_provider=ai_provider,
                 # 2026-04-08 ogt: 補傳 incident_id 以啟用詳情/重診/歷史按鈕
                 incident_id=incident_id,
+                # ADR-073: 路由 TYPE-4D → send_drift_card
+                notification_type=notification_type,
             )
 
             record_alert_chain_success("alertmanager")
@@ -1498,6 +1521,8 @@ async def alertmanager_webhook(
                 confidence=0.0,
                 namespace=namespace,
                 incident_id=fallback_incident_id,
+                # ADR-073: 路由 TYPE-4D → send_drift_card
+                notification_type=notification_type,
             )
 
             return AlertResponse(

apps/api/src/services/telegram_gateway.py

@@ -4582,7 +4582,10 @@ class TelegramGateway:
                     if execution_triggered:
                         import asyncio
                         from src.services.approval_execution import get_execution_service
-                        asyncio.create_task(get_execution_service().execute_approved_action(approval))
+                        _exec_task = asyncio.create_task(
+                            get_execution_service().execute_approved_action(approval)
+                        )
+                        _exec_task.add_done_callback(lambda t: t.exception() if not t.cancelled() else None)
                         logger.info(
                             "telegram_approval_execution_triggered",
                             approval_id=approval_id,