feat: 添加举报功能支持

- 新增 Report 数据模型、DTO、Repository、Service 层
- 实现用户端举报 API (POST /api/v1/reports)
- 实现管理端举报管理 API (列表、详情、处理、批量处理)
- 添加举报自动隐藏机制（达到阈值自动隐藏内容）
- 集成系统通知（举报处理结果通知）
- 更新路由和 Wire 依赖注入配置

Made-with: Cursor

internal/model/init.go

@@ -134,6 +134,9 @@ func autoMigrate(db *gorm.DB) error {
 		&SensitiveWord{},
 		&AuditLog{},
 
+		// 举报
+		&Report{},
+
 		// 日志相关
 		&OperationLog{},  // 操作日志
 		&LoginLog{},      // 登录日志

internal/model/report.go

@@ -0,0 +1,80 @@
+package model
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// ReportTargetType 举报目标类型
+type ReportTargetType string
+
+const (
+	ReportTargetTypePost    ReportTargetType = "post"    // 帖子
+	ReportTargetTypeComment ReportTargetType = "comment" // 评论
+	ReportTargetTypeMessage ReportTargetType = "message" // 消息
+)
+
+// ReportStatus 举报处理状态
+type ReportStatus string
+
+const (
+	ReportStatusPending    ReportStatus = "pending"    // 待处理
+	ReportStatusProcessing ReportStatus = "processing" // 处理中
+	ReportStatusResolved   ReportStatus = "resolved"   // 已确认违规
+	ReportStatusRejected   ReportStatus = "rejected"   // 已驳回
+)
+
+// ReportReason 举报原因类型
+type ReportReason string
+
+const (
+	ReportReasonSpam         ReportReason = "spam"         // 垃圾广告
+	ReportReasonInappropriate ReportReason = "inappropriate" // 违规内容
+	ReportReasonHarassment   ReportReason = "harassment"   // 辱骂/攻击
+	ReportReasonMisinformation ReportReason = "misinformation" // 虚假信息
+	ReportReasonOther        ReportReason = "other"        // 其他
+)
+
+// Report 举报实体
+type Report struct {
+	ID          string           `json:"id" gorm:"type:varchar(36);primaryKey"`
+	ReporterID  string           `json:"reporter_id" gorm:"type:varchar(36);index;index:idx_reports_reporter_status,priority:1;not null"`
+	TargetType  ReportTargetType `json:"target_type" gorm:"type:varchar(20);index;index:idx_reports_target_type_id,priority:1;index:idx_reports_target_status,priority:1;not null"`
+	TargetID    string           `json:"target_id" gorm:"type:varchar(36);index:idx_reports_target_type_id,priority:2;index:idx_reports_target,priority:1;not null"`
+	Reason      ReportReason     `json:"reason" gorm:"type:varchar(30);not null"`
+	Description string           `json:"description" gorm:"type:text"`
+	Status      ReportStatus     `json:"status" gorm:"type:varchar(20);default:pending;index:idx_reports_status_created,priority:1;index:idx_reports_reporter_status,priority:2;index:idx_reports_target_status,priority:2"`
+	HandledBy   *string          `json:"handled_by" gorm:"type:varchar(36);index"`
+	HandledAt   *time.Time       `json:"handled_at" gorm:"type:timestamp"`
+	Result      *string          `json:"result" gorm:"type:text"`
+
+	// 软删除
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	// 时间戳
+	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime;index:idx_reports_status_created,priority:2,sort:desc"`
+	UpdatedAt time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+}
+
+// BeforeCreate 创建前生成UUID
+func (r *Report) BeforeCreate(tx *gorm.DB) error {
+	if r.ID == "" {
+		r.ID = uuid.New().String()
+	}
+	return nil
+}
+
+// TableName 指定表名
+func (Report) TableName() string {
+	return "reports"
+}
+
+// ReportStats 举报统计（用于缓存或查询结果）
+type ReportStats struct {
+	TargetType  ReportTargetType
+	TargetID    string
+	ReportCount int
+	IsHidden    bool
+}

internal/model/system_notification.go

@@ -32,6 +32,10 @@ const (
 	SysNotifyGroupJoinApply    SystemNotificationType = "group_join_apply"    // 加群申请待审批
 	SysNotifyGroupJoinApproved SystemNotificationType = "group_join_approved" // 加群申请通过
 	SysNotifyGroupJoinRejected SystemNotificationType = "group_join_rejected" // 加群申请拒绝
+
+	// 举报相关
+	SysNotifyReportResolved SystemNotificationType = "report_resolved" // 举报已确认违规
+	SysNotifyReportRejected SystemNotificationType = "report_rejected" // 举报已驳回
 )
 
 // SystemNotificationExtra 额外数据