refactor: Simplify AuthMiddleware;

refactor: Move token validation logic to AuthService;
refactor: Remove Redis cache checks from middleware;
fix: Improve error handling for token validation;
refactor: Update Refresh method to use new validation logic;
chore: Clean up unused imports and comments

backend/internal/routes/router.go

@@ -19,17 +19,16 @@ package routes
 
 import (
 	"easywish/internal/controllers"
-	"easywish/internal/database"
 	"easywish/internal/middleware"
+	"easywish/internal/services"
 
 	"github.com/gin-gonic/gin"
-	"github.com/go-redis/redis/v8"
 	"go.uber.org/zap"
 )
 
-func NewRouter(engine *gin.Engine, log *zap.Logger, dbctx database.DbContext, redisClient *redis.Client, groups []RouteGroup) *gin.Engine {
+func NewRouter(engine *gin.Engine, log *zap.Logger, auth services.AuthService, groups []RouteGroup) *gin.Engine {
     apiGroup := engine.Group("/api")
-		apiGroup.Use(middleware.AuthMiddleware(log, dbctx, redisClient))
+		apiGroup.Use(middleware.AuthMiddleware(log, auth))
     for _, group := range groups {
         subgroup := apiGroup.Group(group.BasePath)
         subgroup.Use(group.Middleware...)