✨ feat(web): integrate embedded web server, REST/SSE APIs and modernize configuration

- Add embedded KLALBWebServer with REST API, SSE streaming (200ms) and SPA hosting
- Introduce enableTUN configuration flag with fallback and non-admin execution support
- Refactor LineTable and ConnectLineTable to openConnections and autoConnections
- Rename denyLineTableQuery/Broadcast to denyConnectionQuery/Broadcast with backwards compatibility
- Support runtime config hot-reloading and automatic persistence to klalb-config.json
- Update default Web API port to 4665 and update dashboard submodule reference

.gitignore

@@ -3,3 +3,12 @@
 /klalbs4.json
 /klalbs.json
 /klalbs2.json
+
+# Dashboard / Frontend
+dashboard/node_modules/
+dashboard/dist/
+dashboard/.pnpm-store/
+.pnpm-debug.log*
+dashboard/.env.local
+dashboard/.env.*.local
+