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