fix(config): sync Swing settings after Web updates

Add revisioned configuration events and detached commits so Web changes
refresh clean Swing forms without overwriting unsaved local edits. Preserve
configuration formatting and document the synchronized update workflow.

AGENTS.md

@@ -46,8 +46,9 @@ pnpm dev
 
 - `KLALBConfigItem` is a polymorphic JSON array keyed by `Type`. Adding a type requires a subclass and cases in both default config serializer and deserializer; unknown types must remain preserved.
 - `/api/config` is field-by-field parsing, not whole-object Gson mapping. Keep legacy key aliases in sync with new fields.
-- Vendored Gson is `2.1`: responses that are `JsonElement` instances must be serialized with `JsonElement.toString()`, not reflective `gson.toJson(Object)`.
+- Vendored Gson is `2.1`: HTTP responses that are `JsonElement` instances must be serialized with `JsonElement.toString()`, not reflective `gson.toJson(Object)`; configuration files must use the configured pretty-print Gson path rather than `JsonElement.toString()`.
 - UI strings use `UIEnv.getRsb()`; add keys to both `src/klalb_zh_CN.properties` and `src/klalb_en_US.properties`.
+- Web and Swing configuration writes must use `KLALBProxySystem`'s revisioned detached-candidate commit/event path; do not mutate the canonical config object directly.
 - `KLALBController.PublishedNodeInfo` is the thread-safe source for Tiny/Full node-info responses. Publish name, description, external endpoints, and Extra Routes through the controller method so snapshots and Tiny/Full update flags stay consistent.
 - `RouterInfo` no longer carries a device name. Its wire format retains an empty legacy UTF slot and `RouterInfoPacket` has optional Tiny/Full invalidation flags. Treat codec changes as compatibility work: preserve old-reader behavior and review a whole-mesh rollout.
 - Full node-info carries `extraRoutes` separately from the endpoint `data` list. Keep absent fields compatible with older peers.