Initial commit: split VNOX monorepo into VNOX-Client

Desktop client with egui + wgpu UI, audio pipeline (cpal/opus/rodio),
networking (LNEx protocol), and identity management with encrypted vault.

Jitter buffer module extracted from voice-node for standalone operation.

src/lib.rs

@@ -0,0 +1,5 @@
+pub mod audio;
+pub mod identity;
+pub mod identity_vault;
+pub mod jitter;
+pub mod net;