refactor: extract GameService for Connect 4 NATS/chat handling

Move NATS subscription and chat room management into a dedicated
GameService, following the portigo service pattern. Handlers now
receive the service and call its methods instead of managing
NATS connections directly.

router/router.go

@@ -7,19 +7,20 @@ import (
 	"net/http"
 	"sync"
 
+	"github.com/alexedwards/scs/v2"
+	"github.com/go-chi/chi/v5"
+	"github.com/nats-io/nats.go"
+	"github.com/starfederation/datastar-go/datastar"
+
 	"github.com/ryanhamamura/games/config"
 	"github.com/ryanhamamura/games/connect4"
 	"github.com/ryanhamamura/games/db/repository"
 	"github.com/ryanhamamura/games/features/auth"
 	"github.com/ryanhamamura/games/features/c4game"
+	"github.com/ryanhamamura/games/features/c4game/services"
 	"github.com/ryanhamamura/games/features/lobby"
 	"github.com/ryanhamamura/games/features/snakegame"
 	"github.com/ryanhamamura/games/snake"
-
-	"github.com/alexedwards/scs/v2"
-	"github.com/go-chi/chi/v5"
-	"github.com/nats-io/nats.go"
-	"github.com/starfederation/datastar-go/datastar"
 )
 
 func SetupRoutes(
@@ -40,9 +41,12 @@ func SetupRoutes(
 		setupReload(router)
 	}
 
+	// Services
+	c4Svc := services.NewGameService(nc, queries)
+
 	auth.SetupRoutes(router, queries, sessions)
 	lobby.SetupRoutes(router, queries, sessions, store, snakeStore)
-	c4game.SetupRoutes(router, store, nc, sessions, queries)
+	c4game.SetupRoutes(router, store, c4Svc, sessions)
 	snakegame.SetupRoutes(router, snakeStore, nc, sessions)
 }