feat(admin): 系统公告 - 支持配图草稿与自动回收

Adapted from ddcat-ai/open-ai-canvas#339

Original commit: fcdbe2aa833f31f683f709b7f409a0534ed78e20

Refs #339

Co-authored-by: 宇熙 <101980758+yuxiwl@users.noreply.github.com>

backend/internal/database/schema.go

@@ -49,6 +49,7 @@ func Models() []any {
 		&model.UserSkillState{},
 		&model.Resource{},
 		&model.ResourceDeletionJob{},
+		&model.AnnouncementImageDraft{},
 		&model.Asset{},
 		&model.ProjectAssetLink{},
 		&model.ProjectAssetFolder{},