fix: resolve test compilation errors and restore upstream VERSION

- Add missing interface methods to test stubs (RemoveGroupFromUserAllowedGroups,
  GetNotifyCodeUserRate, IncrNotifyCodeUserRate, UpdateGroupIDByUserAndGroup)
- Fix NewUserService call signatures (add 4th param)
- Fix GetAccountCount return signature (3 values)
- Update api_contract_test.go snapshots for balance_notify fields
- Restore resolveOpenAIMessagesDispatchMappedModel function
- Reset VERSION to upstream 0.1.112

backend/internal/server/middleware/admin_auth_test.go

@@ -39,7 +39,7 @@ func TestAdminAuthJWTValidatesTokenVersion(t *testing.T) {
 			return &clone, nil
 		},
 	}
-	userService := service.NewUserService(userRepo, nil, nil)
+	userService := service.NewUserService(userRepo, nil, nil, nil)
 
 	router := gin.New()
 	router.Use(gin.HandlerFunc(NewAdminAuthMiddleware(authService, userService, nil)))

backend/internal/server/middleware/jwt_auth_test.go

@@ -41,7 +41,7 @@ func newJWTTestEnv(users map[int64]*service.User) (*gin.Engine, *service.AuthSer
 
 	userRepo := &stubJWTUserRepo{users: users}
 	authSvc := service.NewAuthService(nil, userRepo, nil, nil, cfg, nil, nil, nil, nil, nil, nil)
-	userSvc := service.NewUserService(userRepo, nil, nil)
+	userSvc := service.NewUserService(userRepo, nil, nil, nil)
 	mw := NewJWTAuthMiddleware(authSvc, userSvc)
 
 	r := gin.New()