refactor: 移除全局单例、修复分层违规、统一错误与响应

internal/service/mocks_test.go

@@ -130,6 +130,24 @@ func (m *MockUserRepository) FindByIDs(ctx context.Context, ids []int64) ([]*mod
 	return result, nil
 }
 
+// List 分页查询用户列表（管理员，mock 实现）
+func (m *MockUserRepository) List(ctx context.Context, page, pageSize int) ([]*model.User, int64, error) {
+	var all []*model.User
+	for _, u := range m.users {
+		all = append(all, u)
+	}
+	total := int64(len(all))
+	offset := (page - 1) * pageSize
+	if offset >= len(all) {
+		return []*model.User{}, total, nil
+	}
+	end := offset + pageSize
+	if end > len(all) {
+		end = len(all)
+	}
+	return all[offset:end], total, nil
+}
+
 // MockProfileRepository 模拟ProfileRepository
 type MockProfileRepository struct {
 	profiles     map[string]*model.Profile
@@ -474,6 +492,32 @@ func (m *MockTextureRepository) BatchDelete(ctx context.Context, ids []int64) (i
 	return deleted, nil
 }
 
+// ListForAdmin 管理员列表（mock 实现）
+func (m *MockTextureRepository) ListForAdmin(ctx context.Context, page, pageSize int) ([]*model.Texture, int64, error) {
+	var all []*model.Texture
+	for _, t := range m.textures {
+		all = append(all, t)
+	}
+	total := int64(len(all))
+	offset := (page - 1) * pageSize
+	if offset >= len(all) {
+		return []*model.Texture{}, total, nil
+	}
+	end := offset + pageSize
+	if end > len(all) {
+		end = len(all)
+	}
+	return all[offset:end], total, nil
+}
+
+// FindByIDForAdmin 管理员查询（mock 实现，无权限过滤）
+func (m *MockTextureRepository) FindByIDForAdmin(ctx context.Context, id int64) (*model.Texture, error) {
+	if t, ok := m.textures[id]; ok {
+		return t, nil
+	}
+	return nil, nil
+}
+
 
 // ============================================================================
 // Service Mocks