fix: handle slowapi.errors import with fallback

- Add try/except for slowapi.errors import
- Fall back to importing RateLimitExceeded from slowapi directly
- Handles different slowapi package structures across versions
- Fixes integration-tests CI import error

apps/coordinator-api/src/app/main.py

@@ -30,9 +30,14 @@ from prometheus_client import Counter, Histogram, generate_latest, make_asgi_app
 from prometheus_client.core import CollectorRegistry
 from prometheus_client.exposition import CONTENT_TYPE_LATEST
 from slowapi import Limiter, _rate_limit_exceeded_handler
-from slowapi.errors import RateLimitExceeded
 from slowapi.util import get_remote_address
 
+# RateLimitExceeded is now defined in slowapi directly, not in slowapi.errors
+try:
+    from slowapi.errors import RateLimitExceeded
+except ImportError:
+    from slowapi import RateLimitExceeded
+
 from .config import settings
 from .utils.alerting import alert_dispatcher
 from .utils.cache import cache_manager