fix(ai): stabilize GCP Ollama alert lane

apps/api/src/services/openclaw.py

@@ -1142,6 +1142,8 @@ class OpenClawService:
                 exec_context = dict(alert_context) if alert_context else {}
                 if decision.intent == IntentType.DIAGNOSE:
                     exec_context["task_type"] = "diagnose"
+                if self._is_incident_alert_context(alert_context):
+                    exec_context["ollama_model"] = getattr(settings, "ALERT_OLLAMA_MODEL", "gemma3:4b")
 
                 result = await executor.execute(
                     prompt=prompt,