feat(server): add Windows tray controls

[flowing-water1]

Summary

• add a native Windows tray for the standalone codeg-server binary
• open the web console on tray double-click and expose web/logs/quit menu actions
• gracefully stop Axum from the tray quit action
• embed the existing Codeg icon into codeg-server.exe
• add an Open Logs Folder action to the desktop Tauri tray, including localized labels

Validation

• pnpm build
• cargo check
• cargo check --no-default-features --bin codeg-server
• cargo clippy --no-default-features --bin codeg-server -- -D warnings
• cargo test --no-default-features --lib server_tray
• cargo build --release --no-default-features --bin codeg-server
• verified the release executable exposes a 32x32 associated Windows icon