feat: Update JWT token generation to set cookie and modify authentication middleware to use cookie

backend/internal/api/handlers/user_handler.go

@@ -246,7 +246,7 @@ func (h *UserHandler) Login(c *gin.Context) {
 	}
 
 	// Generate JWT token
-	token, err := middleware.GenerateToken(user)
+	token, err := middleware.GenerateToken(user, c)
 	if err != nil {
 		utils.InternalErrorResponse(c, "Error generating token: "+err.Error())
 		return
@@ -292,7 +292,7 @@ func (h *UserHandler) Register(c *gin.Context) {
 	}
 
 	// Generate JWT token
-	token, err := middleware.GenerateToken(user)
+	token, err := middleware.GenerateToken(user, c)
 	if err != nil {
 		utils.InternalErrorResponse(c, "Error generating token: "+err.Error())
 		return