[loop-cycle-3] fix: isolate unit tests from local .env and real Gitea API (#1206)

tests/unit/test_config.py

@@ -18,6 +18,10 @@ def _make_settings(**env_overrides):
     """Create a fresh Settings instance with isolated env vars."""
     from config import Settings
 
+    # Prevent Pydantic from reading .env file (local .env pollutes defaults)
+    _orig_config = Settings.model_config.copy()
+    Settings.model_config["env_file"] = None
+
     # Strip keys that might bleed in from the test environment
     clean_env = {
         k: v
@@ -82,7 +86,10 @@ def _make_settings(**env_overrides):
     }
     clean_env.update(env_overrides)
     with patch.dict(os.environ, clean_env, clear=True):
-        return Settings()
+        try:
+            return Settings()
+        finally:
+            Settings.model_config.update(_orig_config)
 
 
 # ── normalize_ollama_url ──────────────────────────────────────────────────────