feat: initialize Ballet Island 微信小程序 with basic structure and functionality

- Add project configuration for WeChat mini program.
- Create skills lock file for Taroify integration.
- Set up app configuration and styles.
- Implement main app component and index page with welcome message.
- Add health check service to verify backend readiness.
- Configure TypeScript settings and global types.

.gitignore

@@ -0,0 +1,14 @@
+.DS_Store
+node_modules/
+dist/
+bin/
+.cache/
+.swc/
+coverage/
+*.log
+.env
+.env.*
+!.env.example
+project.private.config.json
+*.tsbuildinfo
+