fix：优化项目加载

build.js

@@ -2,6 +2,7 @@
 /**
  * 将静态资源复制到 dist/，便于直接部署到任意静态主机。
  * 产出: dist/index.html, dist/config.json, dist/lib/, dist/image/
+ * 构建时注入 __CACHE_VERSION__ 为时间戳，用于防微信/浏览器强缓存，保证发版后页面可更新。
  */
 const fs = require('fs');
 const path = require('path');
@@ -56,7 +57,11 @@ function main() {
   }
   fs.mkdirSync(DIST, { recursive: true });
 
-  copyFile(path.join(ROOT, 'index.html'), path.join(DIST, 'index.html'));
+  const cacheVersion = String(Date.now());
+  let indexHtml = fs.readFileSync(path.join(ROOT, 'index.html'), 'utf8');
+  indexHtml = indexHtml.replace(/__CACHE_VERSION__/g, cacheVersion);
+  fs.writeFileSync(path.join(DIST, 'index.html'), indexHtml, 'utf8');
+
   copyFile(path.join(ROOT, 'config.json'), path.join(DIST, 'config.json'));
   copyFile(path.join(ROOT, 'api.config.json'), path.join(DIST, 'api.config.json'));
   copyDir(path.join(ROOT, 'lib'), path.join(DIST, 'lib'));