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/cmd/migrate-sqlite-postgres/main.go

@@ -247,6 +247,7 @@ func migrations() []tableMigration {
 		migrateTable[model.UserSkillState]("user_skill_states"),
 		migrateTable[model.Resource]("resources"),
 		migrateTable[model.ResourceDeletionJob]("resource_deletion_jobs"),
+		migrateTable[model.AnnouncementImageDraft]("announcement_image_drafts"),
 		migrateTable[model.Asset]("assets"),
 		migrateTable[model.ProjectAssetLink]("project_asset_links"),
 		migrateTable[model.ProjectAssetFolder]("project_asset_folders"),