feat: add Sora admin backend and fix type inconsistencies

Backend changes:
- Add SoraHandler for admin Sora management APIs
  - GET /api/v1/admin/sora/stats - system statistics
  - GET /api/v1/admin/sora/users - user storage stats
  - GET /api/v1/admin/sora/generations - generation records
  - DELETE /api/v1/admin/sora/users/:id/storage - clear user storage
- Add sora_storage_quota_bytes to AdminUser DTO
- Add SoraStorageQuotaBytes to UpdateUserInput for admin user updates
- Add comprehensive tests for SoraHandler

Frontend changes:
- Add soraAdminAPI for Sora management
- Add sora_storage_quota_bytes and sora_storage_used_bytes to AdminUser type
- Add Sora storage quota field to UserEditModal (GB unit)
- Fix UsageLog type: add media_type, fix duration_ms to optional
- Fix AdminUsageLog type: add channel_id, billing_tier

Test fixes:
- Add window.matchMedia mock to AccountUsageCell.spec.ts
- Add tlsFingerprintProfileAPI mock to EditAccountModal.spec.ts
- Fix loadTLSProfiles function order in EditAccountModal.vue
- Fix translation key references in AccountStatusIndicator.spec.ts

backend/internal/service/admin_service.go

@@ -125,6 +125,8 @@ type UpdateUserInput struct {
 	// GroupRates 用户专属分组倍率配置
 	// map[groupID]*rate，nil 表示删除该分组的专属倍率
 	GroupRates map[int64]*float64
+	// Sora 存储配额（单位：字节，0 表示使用分组或系统默认配额）
+	SoraStorageQuotaBytes *int64
 }
 
 type CreateGroupInput struct {
@@ -628,6 +630,10 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda
 		user.AllowedGroups = *input.AllowedGroups
 	}
 
+	if input.SoraStorageQuotaBytes != nil {
+		user.SoraStorageQuotaBytes = *input.SoraStorageQuotaBytes
+	}
+
 	if err := s.userRepo.Update(ctx, user); err != nil {
 		return nil, err
 	}