feat: implement TS3 protocol layer, session management, and ServerQuery client

- Add real X25519 ECDH key exchange for initivexpand2 bootstrap
- Add P-256 identity key generation with TeamSpeak tomcrypt format
- Add session event loop with tokio::select! for packet/command handling
- Add ServerQuery TCP client with typed parsing (channels, clients, permissions)
- Add Tauri commands: connect (session-based), join_channel, send_message, disconnect
- Add frontend ServerQuery snapshot panel
- Fix CI: Node 22, rustup setup, npm install, workspace checks
- Add mock UDP handshake tests through initserver
- 54 tests passing across shared, tscore, tsaudio, tsdb

.gitignore

@@ -4,6 +4,8 @@ refercence/SimpleBot/
 refercence/ts3stats/
 refercence/tsclientlib/
 refercence/tsdeclarations/
+refercence/teamspeak-management-tools.rs/
+refercence/teamspeak-tts.rs/
 
 # Rust
 src/target/
@@ -11,7 +13,11 @@ src/target/
 
 # Node
 src/tauri-app/frontend/node_modules/
-src/tauri-app/frontend/dist/
+src/tauri-app/frontend/dist/*
+!src/tauri-app/frontend/dist/.gitkeep
+
+# Tauri generated schemas
+src/tauri-app/src-tauri/gen/schemas/
 
 # Build artifacts
 build/