feat(settings): support gateway source switching

tests/test_ai.py

@@ -106,6 +106,47 @@ class AITests(TempDirMixin, unittest.TestCase):
         appconfig.save_cmhub_config({"api_key": "sk-cmhub-secret"}, path=key_path)
         return cfg, key_path
 
+    def test_freeze_runtime_config_keeps_worker_credentials_and_models_in_memory(self):
+        with self.make_temp_dir() as temp_dir:
+            config = self._config()
+            config["ai"]["cmhub"] = {
+                "base_url": "https://cmhub.example.com",
+                "image_alias": "image-hd",
+                "connect_timeout": 3,
+            }
+            cmhub_path = os.path.join(temp_dir, "cmhub.json")
+            models_path = os.path.join(temp_dir, "ai_models.json")
+            self._write_models(models_path)
+            appconfig.save_cmhub_config({"api_key": "sk-before-save"}, path=cmhub_path)
+
+            snapshot = ai.freeze_runtime_config(
+                config,
+                cmhub_config_path=cmhub_path,
+                models_path=models_path,
+                include_cmhub=True,
+            )
+            appconfig.save_cmhub_config({"api_key": "sk-after-save"}, path=cmhub_path)
+            replacement_models = appconfig.list_ai_models(
+                path=models_path,
+                reveal_api_key=True,
+            )
+            for model in replacement_models:
+                model["name"] = "已保存后替换的%s模型" % model["category"]
+            appconfig.save_ai_models_config({"models": replacement_models}, path=models_path)
+
+            self.assertEqual(
+                "sk-before-save",
+                ai._cmhub_runtime(snapshot, "image", cmhub_path)["api_key"],
+            )
+            ai.validate_direct_generation_config(
+                snapshot,
+                "title",
+                models_path=models_path,
+            )
+            self.assertIn("direct_models", snapshot["_cmshopee_ai_runtime"])
+
+        self.assert_removed(temp_dir)
+
     def _collected_tasks(self, temp_dir, cfg, titles=None):
         titles = titles or ["旧标题A", "旧标题B"]
         db.init_db(cfg["db_path"])