LLeMbas Desktop: the server in a window, the CLI's agent on this computer

Tauri 2, no Node. A first-run page chooses the server; then the window is
the server's web UI, whose pages get no IPC. The bundled LLeMbas CLI
(fetched and signature-checked by scripts/fetch-cli.sh) links the computer
with 'lembas login --json' and runs as 'lembas service' while the app runs.
A tray menu starts and stops it. Linux packages from GitHub Actions on a tag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,5 @@
+# Rust and Tauri build output
+/src-tauri/target/
+/src-tauri/gen/
+# The bundled LLeMbas CLI: fetched and verified by scripts/fetch-cli.sh, never committed
+/src-tauri/binaries/lembas-*