feat: 实现域能系统

- 新增域能完整分层：EnergyLog/PostEnergizeLog/DailyExpSummary 模型、EnergyRepo、EnergyService、EnergyController/AdminEnergyController
- 支持签到获取域能(+1)、帖子赋能(-1/-2)/被赋能(+1/+2)、改名扣能(-6)/退款(+6)、删帖扣能(-2)
- 赋能单人单帖上限20域能，每日赋能获得经验上限50
- 管理员支持批量调整域能(owner)和查询域能日志(admin)
- LV0用户(exp<1)禁止签到和发帖，余额为负可签到/被赋能/删帖但不能赋能/改名
- 首次改名免费(通过HasCompletedTask判重)，改名扣能在提交审核时执行
- 移除导航栏手动签到按钮，签到融入域能系统(自动签到)
- 新增个人中心域能TAB展示余额和流水日志(近7天)
- 新增帖子详情页赋能按钮(轻赋/重赋)
- 管理后台新增域能管理和域能日志页面

internal/service/audit_service.go

@@ -44,14 +44,20 @@ type auditTaskCompleter interface {
 	CompleteTask(userID uint, taskType string) (newExp int, levelUp bool, err error)
 }
 
+// energyRenameRefunder 改名审核被拒时返还域能的接口（ISP）
+type energyRenameRefunder interface {
+	RefundOnRenameReject(userID uint) error
+}
+
 // AuditService 审核业务逻辑
 type AuditService struct {
-	auditRepo  auditRepo
-	userRepo   userProfileStore
-	settings   siteSettingsChecker
-	defaultCfg config.AuditConfig
-	notifier   auditNotifier
-	levelSvc   auditTaskCompleter
+	auditRepo        auditRepo
+	userRepo         userProfileStore
+	settings         siteSettingsChecker
+	defaultCfg       config.AuditConfig
+	notifier         auditNotifier
+	levelSvc         auditTaskCompleter
+	energyRefundSvc  energyRenameRefunder
 }
 
 // NewAuditService 构造函数
@@ -66,6 +72,12 @@ func NewAuditService(auditRepo auditRepo, userRepo userProfileStore, settings si
 	}
 }
 
+// WithEnergyRefundService 链式注入域能退款服务
+func (s *AuditService) WithEnergyRefundService(svc energyRenameRefunder) *AuditService {
+	s.energyRefundSvc = svc
+	return s
+}
+
 // ShouldAudit 判断指定用户是否需要走审核流程
 // 规则：admin 及以上角色免审
 func (s *AuditService) ShouldAudit(userID uint) (bool, error) {
@@ -195,11 +207,18 @@ func (s *AuditService) review(reviewerID uint, submissionID uint, approved bool,
 	} else {
 		submission.Status = model.AuditStatusRejected
 		submission.RejectReason = &reason
-		// 通知用户审核被拒
+		// 通知用户审核被拒（改名审核追加域能返还提示）
 		if s.notifier != nil {
 			reasonMsg := reason
+			if submission.AuditType == model.AuditTypeUsername {
+				reasonMsg += "。扣除的域能已被返还"
+			}
 			s.notifier.NotifyAuditRejected(submission.UserID, submission.AuditType, reasonMsg, submission.ID)
 		}
+		// 改名审核被拒 → 返还域能
+		if submission.AuditType == model.AuditTypeUsername && s.energyRefundSvc != nil {
+			_ = s.energyRefundSvc.RefundOnRenameReject(submission.UserID)
+		}
 	}
 	return s.auditRepo.Update(submission)
 }