feat: 添加日志管理和敏感词过滤功能

- 新增日志管理模块：操作日志、登录日志、数据变更日志
- 新增敏感词过滤器 (sanitizer)
- 新增日志异步写入管理器
- 新增日志定时清理服务
- 优化帖子相关服务和上传服务

internal/model/data_change_log.go

@@ -0,0 +1,56 @@
+package model
+
+import (
+	"time"
+)
+
+// ChangeType 变更类型
+type ChangeType string
+
+const (
+	ChangePassword ChangeType = "password"
+	ChangePhone    ChangeType = "phone"
+	ChangeEmail    ChangeType = "email"
+	ChangeNickName ChangeType = "nickname"
+	ChangeAvatar   ChangeType = "avatar"
+	ChangeProfile  ChangeType = "profile"
+	ChangePrivacy  ChangeType = "privacy"
+	ChangeDelete   ChangeType = "delete"
+	ChangeExport   ChangeType = "export"
+	ChangeWithdraw ChangeType = "withdraw"
+)
+
+// OperatorType 操作人类型
+type OperatorType string
+
+const (
+	OperatorTypeSelf   OperatorType = "self"
+	OperatorTypeAdmin  OperatorType = "admin"
+	OperatorTypeSystem OperatorType = "system"
+)
+
+// DataChangeLog 数据变更日志实体
+type DataChangeLog struct {
+	ID           uint      `json:"id" gorm:"primaryKey;autoIncrement"`
+	UserID       string    `json:"user_id" gorm:"type:varchar(36);index:idx_user"`
+	OperatorID   string    `json:"operator_id" gorm:"type:varchar(36);index:idx_operator"`
+	OperatorName string    `json:"operator_name" gorm:"type:varchar(100)"`
+	ChangeType   string    `json:"change_type" gorm:"type:varchar(50);index:idx_change_type"`
+	TargetType   string    `json:"target_type" gorm:"type:varchar(50)"`
+	TargetID     string    `json:"target_id" gorm:"type:varchar(255)"`
+	FieldName    string    `json:"field_name" gorm:"type:varchar(50)"`
+	OldValue     string    `json:"old_value" gorm:"type:text"`
+	NewValue     string    `json:"new_value" gorm:"type:text"`
+	IP           string    `json:"ip" gorm:"type:varchar(45);index:idx_ip"`
+	IPLocation   string    `json:"ip_location" gorm:"type:varchar(100)"`
+	UserAgent    string    `json:"user_agent" gorm:"type:varchar(500)"`
+	Reason       string    `json:"reason" gorm:"type:varchar(500)"`
+	OperatorType string    `json:"operator_type" gorm:"type:varchar(20);index:idx_operator_type"`
+	DeviceID     string    `json:"device_id" gorm:"type:varchar(100)"`
+	ServerIP     string    `json:"server_ip" gorm:"type:varchar(45)"`
+	CreatedAt    time.Time `json:"created_at" gorm:"index:idx_created"`
+}
+
+func (DataChangeLog) TableName() string {
+	return "data_change_logs"
+}