Initial SyncGames tree: agent, Android, deploy, docs.

Session-gated MinIO save sync with AppImage GUI, CLI edit/session flow, and Gitea release helper.

Co-authored-by: Cursor <[email protected]>

docs/linux-gui-appimage.md

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+# Linux GUI + AppImage
+
+The SyncGames AppImage launches a thin PySide6 manager for initial setup and day-to-day session ops.
+
+## Tabs
+
+| Tab | Actions |
+|-----|---------|
+| Setup | Endpoint, keys, device id, save `agent.toml`, Doctor probe, seed example games, install systemd units |
+| Games | List / add / retire games (same TOML as CLI) |
+| Session | Start / End / Status / History / Restore (YES confirm) |
+
+## Build
+
+```bash
+cd agent
+./packaging/build-appimage.sh
+```
+
+Requires network once to fetch `appimagetool` if missing.
+
+## Notes
+
+- Credentials and config are written to `~/.config/syncgames/agent.toml` (mode 0600), not into the AppImage.
+- Watcher automation still uses `systemctl --user enable --now syncgames-watch@<game-id>.service` after units are installed.
+- CLI remains available via `pip install -e .` (`syncgames …`) alongside the GUI.