refactor: rename game package to connect4, drop Game prefix from types

Rename game/ -> connect4/ to avoid c4/game stutter. Drop redundant
Game prefix from exported types (GameStore -> Store, GameInstance ->
Instance, GameStatus -> Status). Rename NATS subjects from game.{id}
to connect4.{id}. URL routes unchanged.

router/router.go

@@ -8,12 +8,12 @@ import (
 	"sync"
 
 	"github.com/ryanhamamura/c4/config"
+	"github.com/ryanhamamura/c4/connect4"
 	"github.com/ryanhamamura/c4/db/repository"
 	"github.com/ryanhamamura/c4/features/auth"
 	"github.com/ryanhamamura/c4/features/c4game"
 	"github.com/ryanhamamura/c4/features/lobby"
 	"github.com/ryanhamamura/c4/features/snakegame"
-	"github.com/ryanhamamura/c4/game"
 	"github.com/ryanhamamura/c4/snake"
 
 	"github.com/alexedwards/scs/v2"
@@ -27,7 +27,7 @@ func SetupRoutes(
 	queries *repository.Queries,
 	sessions *scs.SessionManager,
 	nc *nats.Conn,
-	store *game.GameStore,
+	store *connect4.Store,
 	snakeStore *snake.SnakeStore,
 	assets embed.FS,
 ) {