feat: add Expo React Native client scaffold

- Expo SDK 54 / React Native 0.81 with expo-router
- Tailscale devcontainer feature for direct device connectivity
- Dev proxy for React Native DevTools access over Tailscale
- EAS build configuration for development/preview/production
- Ona automation for Expo dev server

Co-authored-by: Ona <no-reply@ona.com>

apps/aris-client/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+	"editor.codeActionsOnSave": {
+		"source.fixAll": "explicit",
+		"source.organizeImports": "explicit",
+		"source.sortMembers": "explicit"
+	}
+}