Revert "fix(config): sync Swing settings after Web updates"

This reverts commit b6acc6d509.

AGENTS.md

@@ -32,8 +32,8 @@ KLALB is a Java SRv6/load-balancing system. Start at `org.kne.cloud.network.klal
 ## Important Boundaries
 
 - `KLALBConfigItem` is a polymorphic JSON array keyed by case-sensitive `Type`. New types need serializer and deserializer support; preserve unknown items' raw JSON.
-- `/api/config` parses fields and legacy aliases explicitly. Web and Swing writes must use `KLALBProxySystem`'s revision-checked detached-candidate commit path, never mutate the canonical config directly.
-- Vendored Gson is 2.1: serialize HTTP `JsonElement` values with `toString()`; serialize configuration through the configured pretty-print Gson path.
+- `/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)`.
 - UI strings use `UIEnv.getRsb()`; add keys to both `src/klalb_zh_CN.properties` and `src/klalb_en_US.properties`.
 - `KLALBController.PublishedNodeInfo` is the thread-safe node-info source. Publish profile, effective external endpoints, and extra routes through the controller so snapshots and update flags remain coherent. Peer queries are separate profile, endpoint, and extra-route requests; use `NodeInfoQueryCoordinator` when a consumer needs an aggregate detail result.
 - `RouterInfo` retains an empty legacy UTF slot. `RouterInfoPacket` appends optional update flags behind a marker; treat binary codec changes as mesh-compatibility work and preserve old-reader behavior.