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.

miniprogram/config/index.ts

@@ -0,0 +1,32 @@
+import { defineConfig } from '@tarojs/cli'
+
+export default defineConfig<'webpack5'>({
+  projectName: 'ballet-island',
+  designWidth: 375,
+  deviceRatio: {
+    375: 2,
+    640: 1.17,
+    750: 1,
+    828: 0.905,
+  },
+  sourceRoot: 'src',
+  outputRoot: 'dist',
+  framework: 'react',
+  compiler: {
+    type: 'webpack5',
+    prebundle: { enable: false },
+  },
+  cache: { enable: true },
+  defineConstants: {
+    __API_BASE_URL__: JSON.stringify(
+      (process.env.TARO_APP_API_BASE_URL || 'http://127.0.0.1:8080').replace(/\/$/, ''),
+    ),
+  },
+  mini: {
+    postcss: {
+      pxtransform: { enable: true },
+      cssModules: { enable: false },
+    },
+  },
+})
+