feat(user): support fixed UUID registration and enhance bulk import results

- Added support for fixed UUIDs during bulk registration (Search-first + ExternalID mapping)
- Implemented idempotency and visibility restoration for soft-deleted users
- Enhanced bulk upload UI to show 'New/Updated/Unchanged' status and modified fields
- Added logic to reclaim identifiers (login_id) from colliding records
- Added frontend E2E and backend unit tests for UUID integrity and conflict handling
- Fixed i18n, formatting, and mock tests to satisfy code-check
- Applied 'go fix' for 'omitzero' tags and general Go standards

backend/internal/bootstrap/admin_account.go

@@ -136,7 +136,7 @@ func buildSuperAdminBrokerUser(email, name string) *domain.BrokerUser {
 		Email:       email,
 		Name:        name,
 		PhoneNumber: "",
-		Attributes: map[string]interface{}{
+		Attributes: map[string]any{
 			"department":      "Admin",
 			"affiliationType": "internal",
 			"grade":           "",
@@ -170,7 +170,7 @@ func (s *gormSuperAdminStore) CreateUser(ctx context.Context, user *domain.User)
 }
 
 func (s *gormSuperAdminStore) UpdateUserSuperAdmin(ctx context.Context, userID string, name string) (*domain.User, error) {
-	updates := map[string]interface{}{
+	updates := map[string]any{
 		"role":       domain.RoleSuperAdmin,
 		"status":     domain.UserStatusActive,
 		"updated_at": time.Now(),

backend/internal/bootstrap/kratos_seed.go

@@ -31,7 +31,7 @@ func SeedAdminIdentity(idp domain.IdentityProvider) (string, error) {
 		Email:       adminEmail,
 		Name:        adminName,
 		PhoneNumber: "",
-		Attributes: map[string]interface{}{
+		Attributes: map[string]any{
 			"department":      "Admin",
 			"affiliationType": "internal",
 			"grade":           "",
@@ -44,7 +44,7 @@ func SeedAdminIdentity(idp domain.IdentityProvider) (string, error) {
 	var err error
 	var identityID string
 
-	for i := 0; i < maxRetries; i++ {
+	for i := range maxRetries {
 		identityID, err = idp.CreateUser(user, adminPassword)
 		if err == nil {
 			slog.Info("[Bootstrap] Admin identity created in IDP", "email", adminEmail, "idp", idp.Name(), "id", identityID)

backend/internal/bootstrap/sync_admin.go

@@ -54,7 +54,7 @@ func SyncAdminRole(db *gorm.DB, kratosID string) error {
 	}
 
 	// Update role if needed
-	updates := map[string]interface{}{}
+	updates := map[string]any{}
 	if user.Role != domain.RoleSuperAdmin {
 		updates["role"] = domain.RoleSuperAdmin
 	}