添加util.flask；video_clip编辑逻辑

util/flask.py

@@ -0,0 +1,19 @@
+from flask import jsonify
+
+
+def not_found_json_response(**kwargs):
+    response = jsonify({
+        "message": "Not Found",
+        **kwargs
+    })
+    response.status_code = 404
+    return response
+
+
+def error_json_response(message="Error", **kwargs):
+    response = jsonify({
+        "message": message,
+        **kwargs
+    })
+    response.status_code = 403
+    return response