feat(verification): add user identity verification system

Implement a complete user identity verification system with support for multiple identity types (student, teacher, staff, alumni). The system includes user-facing verification submission and status checking endpoints, admin endpoints for reviewing verification requests, middleware for protecting verification-required routes, and integration with the user model to track verification status.

internal/model/init.go

@@ -170,6 +170,9 @@ func autoMigrate(db *gorm.DB) error {
 		// 通话相关
 		&CallSession{},
 		&CallParticipant{},
+
+		// 身份认证相关
+		&VerificationRecord{},
 	)
 	if err != nil {
 		return err

internal/model/user.go

@@ -16,6 +16,28 @@ const (
 	UserStatusInactive UserStatus = "inactive"
 )
 
+// UserIdentity 用户身份类型
+type UserIdentity string
+
+const (
+	UserIdentityGeneral  UserIdentity = "general"  // 普通用户
+	UserIdentityStudent  UserIdentity = "student"  // 学生
+	UserIdentityTeacher  UserIdentity = "teacher"  // 教师
+	UserIdentityStaff    UserIdentity = "staff"    // 职工
+	UserIdentityAlumni   UserIdentity = "alumni"   // 校友
+	UserIdentityExternal UserIdentity = "external" // 外部人员
+)
+
+// VerificationStatus 审核状态
+type VerificationStatus string
+
+const (
+	VerificationStatusNotSubmitted VerificationStatus = "not_submitted" // 未提交
+	VerificationStatusPending      VerificationStatus = "pending"       // 审核中
+	VerificationStatusApproved     VerificationStatus = "approved"      // 已通过
+	VerificationStatusRejected     VerificationStatus = "rejected"      // 已拒绝
+)
+
 // User 用户实体
 type User struct {
 	ID            string  `json:"id" gorm:"type:varchar(36);primaryKey"`
@@ -42,6 +64,10 @@ type User struct {
 	FollowersCount int `json:"followers_count" gorm:"default:0"`
 	FollowingCount int `json:"following_count" gorm:"default:0"`
 
+	// 身份认证
+	Identity           UserIdentity       `json:"identity" gorm:"type:varchar(20);default:general"`
+	VerificationStatus VerificationStatus `json:"verification_status" gorm:"type:varchar(20);default:not_submitted"`
+
 	// 状态
 	Status      UserStatus `json:"status" gorm:"type:varchar(20);default:active"`
 	LastLoginAt *time.Time `json:"last_login_at" gorm:"type:timestamp"`

internal/model/verification.go

@@ -0,0 +1,40 @@
+package model
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type VerificationRecord struct {
+	ID       string             `json:"id" gorm:"type:varchar(36);primaryKey"`
+	UserID   string             `json:"user_id" gorm:"type:varchar(36);index;not null"`
+	Identity UserIdentity       `json:"identity" gorm:"type:varchar(20);not null"`
+	Status   VerificationStatus `json:"status" gorm:"type:varchar(20);default:pending"`
+
+	RealName       string `json:"real_name" gorm:"type:varchar(100)"`
+	StudentID      string `json:"student_id" gorm:"type:varchar(50)"`
+	EmployeeID     string `json:"employee_id" gorm:"type:varchar(50)"`
+	Department     string `json:"department" gorm:"type:varchar(200)"`
+	ProofMaterials string `json:"proof_materials" gorm:"type:text"`
+
+	ReviewedAt   *time.Time `json:"reviewed_at" gorm:"type:timestamp"`
+	ReviewedBy   *string    `json:"reviewed_by" gorm:"type:varchar(36)"`
+	RejectReason string     `json:"reject_reason" gorm:"type:text"`
+
+	CreatedAt time.Time      `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt time.Time      `json:"updated_at" gorm:"autoUpdateTime"`
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+}
+
+func (v *VerificationRecord) BeforeCreate(tx *gorm.DB) error {
+	if v.ID == "" {
+		v.ID = uuid.New().String()
+	}
+	return nil
+}
+
+func (VerificationRecord) TableName() string {
+	return "verification_records"
+}