feat(extension): 缩减配置注入并输出 menav-config.json

- 构建：生成 dist/menav-config.json 供扩展按需加载
- 页面：menav-config-data 仅注入扩展元信息（configUrl/pageTemplates/icons/homePageId/allowedSchemes）
- 运行时：模板判定优先 pageTemplates，兼容旧 cfg.data[pageId].template
- 文档：更新 README 的扩展接口说明

test/p1-7-extension-config-minimal.node-test.js

@@ -0,0 +1,56 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const path = require('node:path');
+
+const { loadHandlebarsTemplates, loadConfig, generateHTML } = require('../src/generator.js');
+
+function withRepoRoot(fn) {
+  const originalCwd = process.cwd();
+  process.chdir(path.join(__dirname, '..'));
+  try {
+    return fn();
+  } finally {
+    process.chdir(originalCwd);
+  }
+}
+
+test('P1-7：页面内不应注入整站 configJSON，应仅保留扩展元信息与最小运行时参数', () => {
+  withRepoRoot(() => {
+    loadHandlebarsTemplates();
+    const config = loadConfig();
+    const html = generateHTML(config);
+
+    const match = html.match(
+      /<script id="menav-config-data"[^>]*>([\s\S]*?)<\/script>/m
+    );
+    assert.ok(match, '应输出 menav-config-data 脚本块');
+
+    const raw = String(match[1] || '').trim();
+    assert.ok(raw.length > 0, 'menav-config-data 内容不应为空');
+
+    const parsed = JSON.parse(raw);
+
+    assert.ok(parsed && typeof parsed === 'object');
+    assert.equal(parsed.configUrl, './menav-config.json');
+    assert.ok(parsed.version, '应包含 version');
+    assert.ok(parsed.timestamp, '应包含 timestamp');
+
+    assert.ok(parsed.icons && typeof parsed.icons === 'object', '应包含 icons 配置（用于运行时）');
+
+    assert.ok(parsed.data && typeof parsed.data === 'object', '应包含 data 对象');
+    assert.ok(parsed.data.homePageId, '应包含 homePageId');
+    assert.ok(
+      parsed.data.pageTemplates && typeof parsed.data.pageTemplates === 'object',
+      '应包含 pageTemplates'
+    );
+
+    // 不应再把 pages/<id>.yml 的完整结构（categories/sites 等）注入到页面中
+    assert.equal(parsed.data.common, undefined);
+    assert.equal(parsed.data.projects, undefined);
+    assert.equal(parsed.data.articles, undefined);
+    assert.equal(parsed.data.bookmarks, undefined);
+    assert.ok(!/"categories"\s*:/.test(raw), '不应包含 categories 字段');
+    assert.ok(!/"sites"\s*:/.test(raw), '不应包含 sites 字段');
+  });
+});
+