refactor: 使用flutter对原先的web项目重构，正在进行中

tmp/dump_levels.mjs

@@ -0,0 +1,25 @@
+// One-off: export all built-in levels to JSON for the Flutter port.
+import { LEVELS, TYPE_LABEL, TYPE_CLASS } from './js/levels/index.js';
+import { writeFileSync } from 'fs';
+
+// Sanity: ensure serializable and report shapes.
+function deepCheck(v, path) {
+  if (v === null || v === undefined) return;
+  if (typeof v === 'function') throw new Error('function at ' + path);
+  if (typeof v === 'object') {
+    if (Array.isArray(v)) { v.forEach((e, i) => deepCheck(e, path + '[' + i + ']')); }
+    else { for (const k of Object.keys(v)) deepCheck(v[k], path + '.' + k); }
+  }
+}
+for (const l of LEVELS) deepCheck(l, l.id || '?');
+
+const out = {
+  levels: LEVELS,
+  typeLabel: TYPE_LABEL,
+  typeClass: TYPE_CLASS,
+};
+writeFileSync('levels_dump.json', JSON.stringify(out));
+console.log('OK levels=', LEVELS.length, 'bytes=', JSON.stringify(out).length);
+for (const l of LEVELS) {
+  console.log(' -', l.id, l.name, 'type=' + l.type, 'w=' + l.width, 'rows=' + (l.grid ? l.grid.length : '?'));
+}