i think its finished

app/__init__.py

@@ -1,6 +1,6 @@
 from flask import Flask
 from app.config import Config
-from app.extensions import db, mail
+from app.extensions import db, mail, limiter
 
 def create_app(config_class=Config):
     app = Flask(__name__)
@@ -9,6 +9,7 @@ def create_app(config_class=Config):
     # Initialize extensions
     db.init_app(app)
     mail.init_app(app)
+    limiter.init_app(app)
 
     # Register Blueprints
     from app.routes import bp as main_bp