feat(config-editor): add RecordValue serializer with tests

extensions/pixelhero-config-editor/src/io/serializer.ts

@@ -0,0 +1,32 @@
+import { RecordValue, isScalar } from './recordValue';
+
+export function serializeValue(v: RecordValue): string {
+  switch (v.kind) {
+    case 'num': return String(v.value);
+    case 'str': return JSON.stringify(v.value);
+    case 'bool': return String(v.value);
+    case 'enumRef': return `${v.qualifier}.${v.member}`;
+    case 'speed': return `AtkSpeedSet[AtkSpeedLv.${v.level}].cd`;
+    case 'arr': return `[${v.items.map(serializeValue).join(',')}]`;
+    case 'obj': {
+      const body = Object.entries(v.props).map(([k, val]) => `${k}:${serializeValue(val)}`).join(',');
+      return `{${body}}`;
+    }
+    case 'raw': return v.text;
+  }
+}
+
+/** 序列化一条顶层记录。首行无缩进（缩进由调用处保留的 trivia 提供）；嵌套字段 8 空格续行；闭合 4 空格。 */
+export function serializeEntry(key: string, obj: RecordValue): string {
+  if (obj.kind !== 'obj') return `${key}:${serializeValue(obj)},`;
+  const props = obj.props;
+  const keys = Object.keys(props);
+  const scalars = keys.filter(k => isScalar(props[k]));
+  const nested = keys.filter(k => !isScalar(props[k]));
+  const scalarTxt = scalars.map(k => `${k}:${serializeValue(props[k])}`).join(',');
+  if (nested.length === 0) return `${key}:{${scalarTxt}},`;
+  const lines = [`${key}:{${scalarTxt},`];
+  for (const k of nested) lines.push(`        ${k}:${serializeValue(props[k])},`);
+  lines.push('    },');
+  return lines.join('\n');
+}