refactor: update repository interfaces and improve dependency injection

- Refactored repository structures to use interfaces instead of concrete types, enhancing flexibility and testability.
- Updated various repository methods to accept interfaces, allowing for better dependency management.
- Modified wire generation to accommodate new repository interfaces, ensuring proper service injection throughout the application.
- Enhanced handler methods to utilize DTOs for filtering and data handling, improving code clarity and maintainability.

internal/repository/group_repo.go

@@ -17,6 +17,7 @@ type GroupRepository interface {
 	Update(group *model.Group) error
 	Delete(id string) error
 	GetByOwnerID(ownerID string, page, pageSize int) ([]model.Group, int64, error)
+	TransferOwner(groupID, oldOwnerID, newOwnerID string) error
 
 	// 群成员操作
 	AddMember(member *model.GroupMember) error
@@ -90,6 +91,32 @@ func (r *groupRepository) Update(group *model.Group) error {
 	return r.db.Save(group).Error
 }
 
+// TransferOwner 转让群主（在事务中更新群主和角色）
+func (r *groupRepository) TransferOwner(groupID, oldOwnerID, newOwnerID string) error {
+	return r.db.Transaction(func(tx *gorm.DB) error {
+		// 更新群组的群主
+		if err := tx.Model(&model.Group{}).Where("id = ?", groupID).Update("owner_id", newOwnerID).Error; err != nil {
+			return err
+		}
+
+		// 更新原群主为管理员
+		if err := tx.Model(&model.GroupMember{}).
+			Where("group_id = ? AND user_id = ?", groupID, oldOwnerID).
+			Update("role", model.GroupRoleAdmin).Error; err != nil {
+			return err
+		}
+
+		// 更新新群主为群主
+		if err := tx.Model(&model.GroupMember{}).
+			Where("group_id = ? AND user_id = ?", groupID, newOwnerID).
+			Update("role", model.GroupRoleOwner).Error; err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
 // Delete 删除群组
 func (r *groupRepository) Delete(id string) error {
 	return r.db.Transaction(func(tx *gorm.DB) error {