refactor(models): Add _resolve_url method to Executor

Extracted URL resolution logic into separate method for better testability

models/executor.py

@@ -14,10 +14,14 @@ class Executor:
     def __init__(self, context: Context):
         self.context = context
 
-    def execute(self, request: RequestModel) -> Response:
+    def _resolve_url(self, request: RequestModel) -> str:
         url = self.context.resolve(request.path)
         if not url.startswith("http"):
             url = f"{self.context.config.base_url}{url}"
+        return url
+
+    def execute(self, request: RequestModel) -> Response:
+        url = self._resolve_url(request)
 
         with httpx.Client() as client:
             resp = client.request(