Initial commit: ReTeamSpeak cross-platform TeamSpeak client

- tscore: Protocol implementation (packets, crypto, connection handshake)
- tsaudio: Audio engine (capture, playback, codec, VAD, jitter buffer)
- tsdb: SQLite database (identities, bookmarks, messages, settings)
- shared: Core types and events
- tauri-app: Tauri v2 desktop application with React frontend
- docs: SRS, SAD, SDD documentation
- CI/CD: GitHub Actions workflow
- 32 unit tests passing

src/shared/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "shared"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+chrono = { workspace = true }
+uuid = { workspace = true }
+toml = { workspace = true }