implement rate limiting for authentication routes and add custom error handling page

containers/auth-gateway/auth_gateway/limiter.py

@@ -0,0 +1,14 @@
+from fastapi import Request
+from slowapi import Limiter
+
+AUTH_RATE_LIMIT = "5/minute"
+
+
+def get_real_client_ip(request: Request) -> str:
+    forwarded_for = request.headers.get("x-forwarded-for", "")
+    if forwarded_for:
+        return forwarded_for.split(",")[0].strip()
+    return request.client.host if request.client else "unknown"
+
+
+limiter = Limiter(key_func=get_real_client_ip)