fix issue 66 - ascii for json dumps to support chinese

Author: shiraayal-tadata

fastapi_mcp/server.py

@@ -259,7 +259,7 @@ async def _execute_api_tool(
             # TODO: Better typing for the AsyncClientProtocol. It should return a ResponseProtocol that has a json() method that returns a dict/list/etc.
             try:
                 result = response.json()
-                result_text = json.dumps(result, indent=2)
+                result_text = json.dumps(result, indent=2, ensure_ascii=False)
             except json.JSONDecodeError:
                 if hasattr(response, "text"):
                     result_text = response.text