feat(lite): lite wallet foundation (inherited working-tree state)

Preserve the previously-uncommitted lite wallet implementation and related dev WIP
under version control:
- src/wallet/ lite services: client bridge, bridge runtime, connection, lifecycle,
  sync, gateway, result parsers, state mapper, artifact contract/resolver, refresh
  services, UI adapters, wallet_backend/capabilities. (Includes two small M1 fixes:
  lifecycle walletReady now parses the response; default chain name -> "main".)
- src/chat/ chat protocol; tests/fixtures/ (lite + hushchat); tools/hushchat_fixture_check.cpp;
  scripts/build-lite-backend-artifact.sh.
- Pre-existing modified app_network/security/wizard, network_refresh_service, sidebar,
  mining_tab, bootstrap dialog, and version headers captured as-is.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app_security.cpp

@@ -616,7 +616,7 @@ void App::checkIdleMining() {
         if (idle_mining_active_) {
             idle_mining_active_ = false;
             idle_scaled_to_idle_ = false;
-            if (settings_ && settings_->getPoolMode()) {
+            if (settings_ && (settings_->getPoolMode() || !supportsSoloMining())) {
                 if (xmrig_manager_ && xmrig_manager_->isRunning())
                     stopPoolMining();
             } else {
@@ -634,7 +634,8 @@ void App::checkIdleMining() {
 
     int idleSec = util::Platform::getSystemIdleSeconds();
     int delay = settings_->getMineIdleDelay();
-    bool isPool = settings_->getPoolMode();
+    bool isPool = settings_->getPoolMode() || !supportsSoloMining();
+    if (isPool && !supportsPoolMining()) return;
     bool threadScaling = settings_->getIdleThreadScaling();
     int maxThreads = std::max(1, (int)std::thread::hardware_concurrency());