Replace FastF1 with Jolpica API for circuit resolution

FastF1's get_event() couldn't resolve several grand prix names
(Qatar, Brazilian, Mexican, Barcelona), causing 500/404 errors.
Now uses Jolpica's race schedule directly — slugifies circuitName
to match against circuits.json with ASCII fallback for unicode.

circuits_service.py

@@ -4,9 +4,6 @@ from typing import Optional
 import functools
 from enum import Enum
 
-# Import FastF1 for dynamic circuit data
-import fastf1
-
 from ergast_service import ErgastService
 from models.circuit import Circuit
 from models.country import Country
@@ -35,9 +32,6 @@ class CircuitService:
         logging.basicConfig(level=logging.INFO)
         self.logger = logging.getLogger(__name__)
 
-        # Initialize FastF1 cache
-        fastf1.Cache.enable_cache('cache')
-
     @functools.lru_cache()
     def _load_circuit_data(self) -> dict[str, Country]:
         """Load and cache circuit data"""