feat: initial commit — odo v0.9.4 Electron desktop app for OpenClaw management

- Electron main process with tray icon and IPC setup
- openclaw-manager.js server bridge
- Architecture design document (ODO_ARCHITECTURE.md)
- preload.js for renderer context bridge

.gitignore

@@ -0,0 +1,8 @@
+node_modules/
+dist/
+build/
+*.dmg
+*.exe
+*.AppImage
+.DS_Store
+manager-config.json