refactor: streamline routes to RESTful naming conventions

Remove /api/ prefix and consolidate route groups:
- /api/lobby/* -> /games, /snake, /logout (top-level)
- /game/{game_id} + /api/game/{game_id}/* -> /games/{id}/*
- /snake/{game_id} + /api/snake/{game_id}/* -> /snake/{id}/*
- /api/auth/* -> /auth/*
- Standardize snake join page to use return_url= (was return=)

features/snakegame/routes.go

@@ -10,10 +10,9 @@ import (
 )
 
 func SetupRoutes(router chi.Router, snakeStore *snake.SnakeStore, nc *nats.Conn, sessions *scs.SessionManager) error {
-	router.Get("/snake/{game_id}", HandleSnakePage(snakeStore, sessions))
-	router.Get("/snake/{game_id}/events", HandleSnakeEvents(snakeStore, nc, sessions))
-
-	router.Route("/api/snake/{game_id}", func(r chi.Router) {
+	router.Route("/snake/{id}", func(r chi.Router) {
+		r.Get("/", HandleSnakePage(snakeStore, sessions))
+		r.Get("/events", HandleSnakeEvents(snakeStore, nc, sessions))
 		r.Post("/dir", HandleSetDirection(snakeStore, sessions))
 		r.Post("/chat", HandleSendChat(snakeStore, nc, sessions))
 		r.Post("/join", HandleSetNickname(snakeStore, sessions))