feat: 优化架构

metro.config.js

@@ -1,5 +1,6 @@
 /** @type {import('expo/metro-config').MetroConfig} */
 const { getDefaultConfig } = require('expo/metro-config');
+const path = require('path');
 
 const config = getDefaultConfig(__dirname);
 
@@ -10,6 +11,11 @@ config.resolver.assetExts.push('wasm');
 // The package doesn't properly export "./index" in its exports field
 config.resolver.unstable_enablePackageExports = false;
 
+// Support TypeScript path aliases (@/ -> ./src/)
+config.resolver.alias = {
+  '@': path.resolve(__dirname, 'src'),
+};
+
 // NOTE: enhanceMiddleware is marked as deprecated in Metro's types,
 // but there's currently no official alternative for custom dev server headers.
 // For production, configure COEP/COOP headers on your hosting platform.