feat(telegram): enforce canonical product routing

apps/api/src/services/post_execution_verifier.py

@@ -410,9 +410,10 @@ async def _send_rollback_proposal_alert(
     不自動執行 rollback，僅通知人工評估。
     """
     try:
-        from src.core.config import get_settings
-        from src.services.telegram_gateway import get_telegram_gateway
-        _settings = get_settings()
+        from src.services.telegram_gateway import (
+            _telegram_send_delivery_succeeded,
+            get_telegram_gateway,
+        )
         gateway = get_telegram_gateway()
 
         regressions = assessment.get("regressions", [])
@@ -429,20 +430,25 @@ async def _send_rollback_proposal_alert(
             f"<i>此為提案，不會自動執行 Rollback</i>"
         )
 
-        target_chat_id = _settings.SRE_GROUP_CHAT_ID
-        await gateway._send_request(
-            "sendMessage",
-            {
-                "chat_id": target_chat_id,
-                "text": text,
-                "parse_mode": "HTML",
-            },
-        )
-        logger.info(
-            "rollback_proposal_sent",
-            incident_id=incident_id,
-            score=score,
+        delivery = await gateway.send_canonical_message(
+            product_id="awoooi",
+            signal_family="incident_lifecycle",
+            severity="P1",
+            text=text,
+            parse_mode="HTML",
         )
+        if _telegram_send_delivery_succeeded(delivery):
+            logger.info(
+                "rollback_proposal_sent",
+                incident_id=incident_id,
+                score=score,
+            )
+        else:
+            logger.warning(
+                "rollback_proposal_blocked_no_send",
+                incident_id=incident_id,
+                score=score,
+            )
     except Exception:
         logger.warning(
             "rollback_proposal_send_failed",