fix(telegram): 修復 Incident 無 title 欄位導致所有 Telegram 推送失敗

根因: _push_decision_to_telegram() 有兩處引用 incident.title，
但 Incident model 從來沒有此欄位，導致所有告警卡片推送都
拋 AttributeError，事件在 telegram_decision_push_failed 靜默失敗。

修法:
- line 188: message 改用 signal annotation summary/description/alert_name
- line 249: TYPE-1 title 改用 alertname label / signal.alert_name

影響: 自從 decision_manager 加入這兩行以來，所有 Telegram 通知都沒發出
（包含 TYPE-1 資訊通知和 TYPE-3 審批卡）

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

apps/api/src/services/decision_manager.py

@@ -182,10 +182,16 @@ async def _push_decision_to_telegram(
             try:
                 from src.services.alert_rule_engine import match_rule as _match_rule
                 _labels = incident.signals[0].labels if incident.signals else {}
+                # 2026-04-12 ogt: Incident 沒有 title 欄位，用 signal annotation summary
+                _sig_msg = (
+                    incident.signals[0].annotations.get("summary", "") or
+                    incident.signals[0].annotations.get("description", "") or
+                    incident.signals[0].alert_name
+                ) if incident.signals else ""
                 _rule_resp = _match_rule({
                     "labels": _labels,
                     "alert_type": _labels.get("alertname", target),
-                    "message": incident.title or "",
+                    "message": _sig_msg,
                     "target_resource": target,
                     "namespace": incident.signals[0].labels.get("namespace", "awoooi-prod") if incident.signals else "awoooi-prod",
                     "severity": risk_level,
@@ -244,9 +250,14 @@ async def _push_decision_to_telegram(
 
         if _notif_type == NotificationType.TYPE_1:
             # 純資訊通知 — 無按鈕
+            # 2026-04-12 ogt: Incident 沒有 title 欄位，用 alertname
+            _info_title = (
+                incident.signals[0].labels.get("alertname", "") or
+                incident.signals[0].alert_name
+            ) if incident.signals else "告警通知"
             tg_result = await gateway.send_info_notification(
                 incident_id=incident.incident_id,
-                title=incident.title or "告警通知",
+                title=_info_title or "告警通知",
                 message=reasoning[:200] if reasoning else description[:200],
                 alertname=incident.signals[0].labels.get("alertname", "") if incident.signals else "",
                 severity="info",