feat: add admin work visibility controls

server-rs/crates/spacetime-module/src/big_fish/tables.rs

@@ -30,7 +30,7 @@ pub struct BigFishCreationSession {
     pub(crate) like_count: u32,
     #[default(None::<Timestamp>)]
     pub(crate) published_at: Option<Timestamp>,
-    // ???????????????????????????????
+    // 后台可见性开关；默认显示，隐藏后不进入公开列表。
     #[default(WORK_VISIBLE_DEFAULT)]
     pub(crate) visible: bool,
 }