feat(models): 对齐 vivid 新改动——模型删除改软删,重导不丢计数/定价

- model_configs 加 deleted_at(gorm 软删),List/Get 自动过滤,
  GetAny/Unscoped 用于复活与孤儿清理路径
- 渠道同步/删渠道/管理端删除模型的孤儿清理全部走软删
- 导入时若命中软删行:UpdateAny + deleted_at=NULL 复活,
  generation_count 与原定价保留(vivid a42f32c 同语义)
- provider 时代残留仍物理删除(DeleteHard),不留软删垃圾
- OrphanModelIDs 跳过已软删行,避免重复清扫
- btn-primary 禁用态改浅灰填充(vivid d636105)

核对过已等价的:vivid 僵尸任务兜底(我们的 ResumeStaleJob+
PurgeStale+MarkRefunded 同语义)、产物 MIME 魔数嗅探、
retention 按创建时间、渠道同步弹窗(开关+别名)均已覆盖。

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

backend/internal/model/models.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"gorm.io/datatypes"
+	"gorm.io/gorm"
 )
 
 type User struct {
@@ -160,8 +161,12 @@ type ModelConfig struct {
 	// successful generation. Independent of the event_log (which is subject to
 	// retention / manual clearing), so the admin "次数" is a true running total.
 	GenerationCount int64 `gorm:"not null;default:0"`
-	CreatedAt       time.Time
-	UpdatedAt       time.Time
+	// DeletedAt soft-deletes the row (vivid parity): hidden from every normal
+	// path, but the row + its counters survive so a re-import revives it
+	// without losing generation_count or pricing.
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+	CreatedAt time.Time
+	UpdatedAt time.Time
 }
 
 func (m ModelConfig) EffectiveName() string {

backend/internal/repo/channel_repo.go

@@ -212,13 +212,14 @@ func (r *ChannelRepository) ChannelIDsByModel(ctx context.Context, modelID strin
 }
 
 // OrphanModelIDs returns local model ids that no channel binds anymore.
+// Soft-deleted rows are skipped — they're already gone from every live path.
 func (r *ChannelRepository) OrphanModelIDs(ctx context.Context) ([]string, error) {
 	var ids []string
 	err := r.db.WithContext(ctx).
 		Table("model_configs").
 		Select("model_configs.id").
 		Joins("LEFT JOIN channel_models ON channel_models.model_id = model_configs.id").
-		Where("channel_models.model_id IS NULL").
+		Where("channel_models.model_id IS NULL AND model_configs.deleted_at IS NULL").
 		Scan(&ids).Error
 	return ids, err
 }

backend/internal/repo/model_repo.go

@@ -44,6 +44,16 @@ func (r *ModelRepository) Get(ctx context.Context, modelID string) (*model.Model
 	return &item, nil
 }
 
+// GetAny includes soft-deleted rows — the import/revive path and orphan
+// cleanup need to see rows normal queries hide.
+func (r *ModelRepository) GetAny(ctx context.Context, modelID string) (*model.ModelConfig, error) {
+	var item model.ModelConfig
+	if err := r.db.WithContext(ctx).Unscoped().First(&item, "(alias <> '' AND alias = ?) OR (alias = '' AND id = ?)", modelID, modelID).Error; err != nil {
+		return nil, err
+	}
+	return &item, nil
+}
+
 func (r *ModelRepository) NameMap(ctx context.Context) (map[string]string, error) {
 	items, err := r.List(ctx)
 	if err != nil {
@@ -72,18 +82,40 @@ func (r *ModelRepository) Create(ctx context.Context, item *model.ModelConfig) e
 }
 
 func (r *ModelRepository) Update(ctx context.Context, modelID string, patch map[string]any) (*model.ModelConfig, error) {
+	return r.update(ctx, modelID, patch, false)
+}
+
+// UpdateAny can reach soft-deleted rows (revive path: patch deleted_at=NULL).
+func (r *ModelRepository) UpdateAny(ctx context.Context, modelID string, patch map[string]any) (*model.ModelConfig, error) {
+	return r.update(ctx, modelID, patch, true)
+}
+
+func (r *ModelRepository) update(ctx context.Context, modelID string, patch map[string]any, anyState bool) (*model.ModelConfig, error) {
 	patch["updated_at"] = time.Now()
-	if err := r.db.WithContext(ctx).Model(&model.ModelConfig{}).Where("id = ?", modelID).Updates(patch).Error; err != nil {
+	q := r.db.WithContext(ctx)
+	if anyState {
+		q = q.Unscoped()
+	}
+	if err := q.Model(&model.ModelConfig{}).Where("id = ?", modelID).Updates(patch).Error; err != nil {
 		return nil, err
 	}
 	var item model.ModelConfig
-	if err := r.db.WithContext(ctx).First(&item, "id = ?", modelID).Error; err != nil {
+	if err := q.First(&item, "id = ?", modelID).Error; err != nil {
 		return nil, err
 	}
 	return &item, nil
 }
 
+// Delete soft-deletes the model (gorm.DeletedAt): the row keeps its counters
+// and pricing so re-importing it later revives the same record.
 func (r *ModelRepository) Delete(ctx context.Context, modelID string) (int64, error) {
 	res := r.db.WithContext(ctx).Delete(&model.ModelConfig{}, "id = ?", modelID)
 	return res.RowsAffected, res.Error
 }
+
+// DeleteHard physically removes the row — only for legacy/provider-era rows
+// that must not linger as soft-deleted junk.
+func (r *ModelRepository) DeleteHard(ctx context.Context, modelID string) (int64, error) {
+	res := r.db.WithContext(ctx).Unscoped().Delete(&model.ModelConfig{}, "id = ?", modelID)
+	return res.RowsAffected, res.Error
+}

backend/internal/service/channel.go

@@ -381,11 +381,12 @@ func (s *ChannelService) PurgeOrphanModels(ctx context.Context) (int, error) {
 	}
 	n := 0
 	for _, id := range ids {
-		m, gerr := s.models.Get(ctx, id)
+		m, gerr := s.models.GetAny(ctx, id)
 		if gerr != nil || m == nil || m.Provider == "channel" {
 			continue
 		}
-		if _, derr := s.models.Delete(ctx, id); derr == nil {
+		// provider 时代残留行没有复活路径，直接物理删除，不留软删垃圾。
+		if _, derr := s.models.DeleteHard(ctx, id); derr == nil {
 			n++
 		}
 	}
@@ -454,7 +455,8 @@ func (s *ChannelService) ImportModels(ctx context.Context, channelID string, spe
 			return fmt.Errorf("别名 %s 被多个上游模型复用", localID)
 		}
 		seenAliases[localID] = upID
-		existing, gerr := s.models.Get(ctx, localID)
+		// GetAny: 软删行也纳入——重导同一模型时复活原行，计数/定价不丢。
+		existing, gerr := s.models.GetAny(ctx, localID)
 		if gerr != nil && !errors.Is(gerr, gorm.ErrRecordNotFound) {
 			existing = nil
 		}
@@ -481,7 +483,10 @@ func (s *ChannelService) ImportModels(ctx context.Context, channelID string, spe
 				return fmt.Errorf("model %s: %w", localID, err)
 			}
 		} else {
-			if _, err := s.models.Update(ctx, localID, patch); err != nil {
+			if local.DeletedAt.Valid {
+				patch["deleted_at"] = nil // revive
+			}
+			if _, err := s.models.UpdateAny(ctx, localID, patch); err != nil {
 				return fmt.Errorf("model %s: %w", localID, err)
 			}
 		}