fix(ai): stabilize GCP Ollama alert lane

apps/api/models.json

@@ -25,7 +25,7 @@
         "log_anomaly": "deepseek-r1:14b",
         "nemoclaw": "deepseek-r1:14b",
         "playbook_draft": "qwen3:14b",
-        "code_review": "qwen2.5-coder:32b",
+        "code_review": "qwen2.5-coder:7b",
         "embedding": "bge-m3:latest",
         "rag_generate": "qwen3:14b",
         "image_analysis": "minicpm-v:latest",
@@ -175,7 +175,7 @@
       },
       "pr_code_review": {
         "phase": 32,
-        "model": "qwen2.5-coder:32b",
+        "model": "qwen2.5-coder:7b",
         "timeout_seconds": 120,
         "purpose": "Gitea PR 自動審查"
       },