fix(gitea-webhook): analysis.model_dump() 對 dict 失敗

_call_openclaw_push_review 回傳 dict，不是 Pydantic model
改用 hasattr 判斷是否有 model_dump()

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

apps/api/src/services/gitea_webhook_service.py

@@ -299,7 +299,8 @@ class GiteaWebhookService:
             "repo": repo,
             "target": target,
             "created_at": now_taipei_iso(),
-            "analysis": analysis.model_dump() if analysis else None,
+            # 2026-04-12 ogt: _call_openclaw_push_review 回傳 dict，無 model_dump()
+            "analysis": analysis.model_dump() if hasattr(analysis, "model_dump") else analysis,
             "metadata": metadata,
         }