limit max content length and UI upgrade

app.py

@@ -32,6 +32,7 @@ class CustomFlask(Flask):
 
 app = CustomFlask(__name__, static_folder='static', template_folder='templates')
 ensure_dirs()
+app.config['MAX_CONTENT_LENGTH'] = 5 * 1024 * 1024
 
 
 # ---------- Data Utilities ----------
@@ -212,4 +213,3 @@ def api_segment():
 if __name__ == '__main__':
     port = int(os.environ.get('PORT', 7860))
     app.run(host='0.0.0.0', port=port)
-