feat(flywheel): Phase 2-3/2-5 — auto_repair outcome 寫入 + 134 筆 alertname 回填腳本

ADR-073 Phase 2-3: _try_auto_repair_background() 修復執行後寫入 Incident.outcome
- effectiveness_score: 5(成功) / 2(失敗)
- human_feedback: auto_repair:<playbook_id>:success|failed
- should_remember: True(成功) → KMConversionService 飛輪入口
- 讓 KMConversionService 可依 outcome 判斷 EXECUTION_SUCCESS

ADR-073 Phase 2-5: scripts/backfill_alertname.py
- UPDATE incidents SET alertname = COALESCE(signals->0->>'alertname', signals->0->>'alert_name')
- 已在 Pod 執行：134 筆 NULL → 0 筆 (2026-04-12 ogt)

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

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

@@ -207,6 +207,25 @@ async def _try_auto_repair_background(
                 },
             )
 
+        # ADR-073 Phase 2-3: 自動修復結果 → 寫入 Incident outcome (2026-04-12 ogt)
+        # 讓 KMConversionService 可依 outcome 判斷是否為 EXECUTION_SUCCESS
+        if result:
+            _effectiveness = 5 if result.success else 2
+            _feedback = (
+                f"auto_repair:{result.playbook_id}:success"
+                if result.success
+                else f"auto_repair:{result.playbook_id}:failed:{result.error}"
+            )
+            try:
+                await incident_service.update_outcome(
+                    incident_id=incident_id,
+                    effectiveness_score=_effectiveness,
+                    human_feedback=_feedback,
+                    should_remember=result.success,
+                )
+            except Exception as _outcome_err:
+                logger.warning("auto_repair_outcome_write_failed", error=str(_outcome_err))
+
         # 2026-04-10 Claude Sonnet 4.6 Asia/Taipei: 自動修復後更新 Telegram 卡片
         # 透過 TelegramGateway Service 層移除按鈕並回覆結果 (積木化鐵律)
         if result: