release 1.0.1: update from Gitea, Linux-only CLI, desktop app for Linux and Windows

The updater reads the latest release from Gitea. update::apply refuses to
overwrite anything but the CLI. Release workflow builds the Linux CLI;
scripts/build-gui.sh builds the Linux and Windows desktop app. Docs say Linux
and Windows only.

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

apps/gui/src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Sabia",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "identifier": "dev.sabia.app",
   "build": {
     "frontendDist": "../ui"