refactor(backend): declarative effects (#8128)

* refactor(core): type notice statuses behind the frozen wire contract

* refactor(utils): unified retry and strategy-list helpers

* refactor(feat): declarative effect registry for verge and clash patches

* refactor(core): derive refresh announcements from transaction commit

* refactor(core): fold tray, hotkey, autostart updates into effect ensures

* refactor(utils): migrate remaining bounded retry loops

* docs: add src-tauri architecture guardrails

* refactor(core): coalesce burst refresh announcements

* refactor(core): complete bounded service retry migration

* ci(backend): add architecture ban gates

* test(feat): freeze representative effect registry mappings

* docs(backend): record dead wire contract entries

* chore(core): document watcher exit conditions

* fix(backend): preserve applied state across later failures

* fix(config): retain runtime after an applied core replacement

* refactor(backend): flatten refresh publication and retry policies

* docs(backend): focus guardrails on architecture ownership

* refactor(effects): use one execution order

* fix(config): publish retained runtime and reconcile proxy settings

src-tauri/src/cmd/proxy.rs

@@ -139,6 +139,7 @@ pub async fn sync_tray_proxy_selection() -> CmdResult<()> {
 }
 
 async fn run_tray_sync_loop() {
+    // Permanent watcher: keeps syncing until a pass finds no pending sync request.
     loop {
         match Tray::global().update_menu().await {
             Ok(_) => {