bug: fix infer_lisa() because of the body dumped to json two times

app.py

@@ -177,8 +177,10 @@ def infer_lisa_gradio(request_input: StringPromptApiRequestBody) -> JSONResponse
 
 @app.post("/infer_lisa")
 def infer_lisa(request_input: StringPromptApiRequestBody) -> JSONResponse:
-    body = infer_lisa_gradio(request_input=request_input)
-    return JSONResponse(status_code=200, content={"body": json.dumps(body)})
+    dumped = infer_lisa_gradio(request_input=request_input)
+    app_logger.info(f"json.dumps(body) type:{type(dumped)}, len:{len(dumped)}.")
+    app_logger.debug(f"complete json.dumps(body):{dumped}.")
+    return JSONResponse(status_code=200, content={"body": dumped})
 
 
 @app.post("/infer_samgis")