ci(deploy): standardize docker compose env file usage across scripts

- Added --env-file .env to all docker compose commands for consistent environment variable loading
- Added MISTRAL_API_KEY validation in deploy.sh with fatal error if missing
- Added --force-recreate flag to recipe-api restarts in disable/enable receipt trace scripts
- Added .env file existence check in rebuild_flutter.sh
- Added API service recreation logic in deploy.sh when backend/importer services are updated

scripts/enable_receipt_trace.sh

@@ -19,11 +19,11 @@ fi
 echo "RECEIPT_TRACE_DECISIONS=1 satt i .env"
 
 echo "Bygger och startar om recipe-api..."
-docker compose -f compose.yml -f compose.flutter.yml up -d --build recipe-api
+docker compose --env-file .env -f compose.yml -f compose.flutter.yml up -d --build --force-recreate recipe-api
 
 mkdir -p logs
 LOG_FILE="logs/receipt_decisions_$(date +%Y%m%d_%H%M%S).log"
 echo "Startar loggning till $LOG_FILE"
 echo "Tryck Ctrl+C för att avsluta loggströmmen."
 
-docker compose -f compose.yml -f compose.flutter.yml logs -f recipe-api | tee "$LOG_FILE"
+docker compose --env-file .env -f compose.yml -f compose.flutter.yml logs -f recipe-api | tee "$LOG_FILE"