fix: rescue gcp ollama through proxy

tests/test_ollama_resolve.py

@@ -75,6 +75,31 @@ def test_resolve_falls_back_on_request_exception():
     assert host == 'http://fallback.example:11434'
 
 
+def test_resolve_uses_primary_proxy_rescue_before_secondary():
+    """正式主機直連 GCP-A 不通時，先走 110 primary proxy，再考慮 GCP-B。"""
+    from services import ollama_service as oss
+
+    fake_ok = MagicMock(status_code=200)
+    seen_urls = []
+
+    def fake_get(url, timeout=None):
+        seen_urls.append(url)
+        if url == f"{oss.OLLAMA_HOST_PRIMARY}/api/version":
+            raise Exception("primary direct timeout")
+        if url == f"{oss.OLLAMA_HOST_PRIMARY_PROXY}/api/version":
+            return fake_ok
+        raise AssertionError(f"should not reach {url}")
+
+    with patch('services.ollama_service.requests.get', side_effect=fake_get):
+        host = oss.resolve_ollama_host()
+
+    assert host == oss.OLLAMA_HOST_PRIMARY_PROXY
+    assert seen_urls == [
+        f"{oss.OLLAMA_HOST_PRIMARY}/api/version",
+        f"{oss.OLLAMA_HOST_PRIMARY_PROXY}/api/version",
+    ]
+
+
 # ═══════════════════════════════════════════════════════════════════════════
 # B4 — mark_unhealthy 行為
 # ═══════════════════════════════════════════════════════════════════════════