MVP frontend+backend

backend/app/rate_limit.py

@@ -0,0 +1,10 @@
+"""Shared rate-limiter instance.
+
+Lives in its own module so routers can import it without triggering the
+circular import that would occur if they imported from app.main.
+"""
+
+from slowapi import Limiter
+from slowapi.util import get_remote_address
+
+limiter = Limiter(key_func=get_remote_address)