feat(server): integrate UDP video service and normalize database schema

- Implement UDPVideoService to stream MJPEG video frames from ESP32s via UDP and send control commands.
- Normalize race database schema:
  - Remove redundant driver_ids array from races table (migration 011).
  - Move per-driver outcomes (total_time_ms, best_lap_ms, position) to race_drivers table (migration 012).
  - Add device_id column to lobby_drivers to link active physical devices (migration 013).
- Update WebSocket handler to pass lobbySvc, driversSvc, and videoSvc for driver identity tracking, syncing in-memory driver metadata, and forwarding WS controls to physical cars.
- Add CORS middleware to HTTP routes.
- Regenerate Swagger documentation.

server/internal/storage/postgres/migrations/013_driver_device.sql

@@ -0,0 +1,6 @@
+-- 013_driver_device.sql — add device_id to lobby_drivers.
+--
+-- Represents the currently selected physical ESP32 DEVICE_ID (0..127) for a driver.
+-- This device is pinned to the driver during races and released when the race ends or they leave.
+
+ALTER TABLE lobby_drivers ADD COLUMN IF NOT EXISTS device_id INT;