feat(config-editor): extension entry + minimal Vue panel proving end-to-end IPC

Task 12 of plan 2026-06-20-config-editor-foundation. Adds:
- src/main/index.ts: onLoad + message handlers (return value = request resolve,
  per Cocos 3.x verified IPC mechanism; fallback note left in plan)
- src/panels/default/{index,app}.ts: Editor.Panel.define host + Vue 3 minimal
  app (table switcher, key list, record JSON dump)
- static/template/default/index.html + static/style/default/index.css

Deviation from plan (necessary, flagged): esbuild.config.mjs now marks
node:fs/node:path as external for the panel entry (platform:'browser').
The plan's panel reads static template/style at runtime via Node fs, which
requires these builtins; Cocos panel runs in an Electron renderer that
provides them. Without this, esbuild errors with 'Could not resolve node:fs'.

Build verified: dist/main.js (9.5mb, typescript compiler API bundled) and
dist/panels/default.js (628kb, vue.esm-bundler bundled) both generate.

extensions/pixelhero-config-editor/esbuild.config.mjs

@@ -11,9 +11,12 @@ const common = {
   alias: { 'vue': 'vue/dist/vue.esm-bundler.js' },
 };
 
+// 面板进程在 Cocos 的 Electron 渲染层运行，可访问 Node 内建（fs/path），但 vue 必须
+// 打进浏览器侧 IIFE。因此面板项用 platform:'browser' + 把 node: 内建标为 external，
+// 交由运行时解析；这样 esbuild 既不抱怨，又保持 plan 的"运行时读 static 文件"语义。
 const entries = [
   { entryPoints: ['src/main/index.ts'], outfile: 'dist/main.js', platform: 'node', format: 'cjs', external: [] },
-  { entryPoints: ['src/panels/default/index.ts'], outfile: 'dist/panels/default.js', platform: 'browser', format: 'iife', external: [] },
+  { entryPoints: ['src/panels/default/index.ts'], outfile: 'dist/panels/default.js', platform: 'browser', format: 'iife', external: ['node:fs', 'node:path'] },
 ];
 
 if (watch) {

extensions/pixelhero-config-editor/src/main/index.ts

@@ -0,0 +1,16 @@
+import { store } from './store';
+
+module.exports = {
+  onLoad() { store.reloadAll(); },
+
+  'open-panel'() { Editor.Panel.open('pixelhero-config-editor'); },
+
+  'query-schema'(_event: unknown, id?: string) { return store.querySchema(id as any); },
+  'query-enums'() { return store.queryEnums(); },
+  'query-keys'(_event: unknown, id: string) { return store.queryKeys(id as any); },
+  'query-record'(_event: unknown, id: string, key: string) { return store.queryRecord(id as any, key); },
+  'query-preview-desc'(_event: unknown, hero: any) { return store.queryPreviewDesc(hero); },
+  'validate'(_event: unknown, id: string) { return store.validate(id as any); },
+  'save-record'(_event: unknown, id: string, key: string, value: any) { return store.saveRecord(id as any, key, value); },
+  'revert-record'(_event: unknown, id: string, key: string) { return store.revertRecord(id as any, key); },
+};

extensions/pixelhero-config-editor/src/panels/default/app.ts

@@ -0,0 +1,38 @@
+import { createApp, defineComponent, reactive } from 'vue';
+
+export const App = defineComponent({
+  setup() {
+    const state = reactive({ table: 'hero' as string, keys: [] as string[], picked: '' as string, detail: '' as string });
+    async function load() {
+      const keys = await Editor.Message.request('pixelhero-config-editor', 'query-keys', state.table);
+      state.keys = keys || [];
+      state.picked = ''; state.detail = '';
+    }
+    async function pick(k: string) {
+      state.picked = k;
+      const v = await Editor.Message.request('pixelhero-config-editor', 'query-record', state.table, k);
+      state.detail = JSON.stringify(v, null, 2);
+    }
+    load();
+    return { state, load, pick };
+  },
+  template: `
+    <div>
+      <div class="row">
+        <label>表：</label>
+        <select v-model="state.table" @change="load">
+          <option value="hero">英雄/怪物</option>
+          <option value="skill">技能</option>
+          <option value="field">驻场技能</option>
+        </select>
+        <span style="margin-left:12px;color:#888">共 {{ state.keys.length }} 条（端到端 IPC 已打通）</span>
+      </div>
+      <ul>
+        <li v-for="k in state.keys" :key="k" @click="pick(k)" :style="state.picked===k ? 'font-weight:bold' : ''">{{ k }}</li>
+      </ul>
+      <pre v-if="state.detail" style="white-space:pre-wrap;background:var(--color-normal-fill);padding:8px">{{ state.detail }}</pre>
+    </div>
+  `,
+});
+
+export function mount(el: HTMLElement) { createApp(App).mount(el); }

extensions/pixelhero-config-editor/src/panels/default/index.ts

@@ -0,0 +1,14 @@
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { mount } from './app';
+
+const template = readFileSync(join(__dirname, '../../../static/template/default/index.html'), 'utf-8');
+const style = readFileSync(join(__dirname, '../../../static/style/default/index.css'), 'utf-8');
+
+module.exports = Editor.Panel.define({
+  template,
+  style,
+  $: { app: '#app' },
+  ready() { mount(this.$.app); },
+  close() { /* Vue 卸载随面板进程退出自动清理 */ },
+});

extensions/pixelhero-config-editor/static/style/default/index.css

@@ -0,0 +1,7 @@
+#app { color: var(--color-font-normal); font-size: 12px; }
+.row { margin: 6px 0; }
+button { margin-right: 8px; }
+ul { list-style: none; padding: 0; max-height: 360px; overflow:auto; }
+li { padding: 3px 6px; cursor: pointer; }
+li:hover { background: var(--color-hover-bg); }
+.err { color: var(--color-warn); }

extensions/pixelhero-config-editor/static/template/default/index.html

@@ -0,0 +1 @@
+<div id="app" style="padding:12px;"></div>