docs: add hands-on Cordis tutorial

Seven-chapter tutorial under docs/cordis-tutorial/ for agent developers
new to Cordis: first plugin, lifecycle/effects, services, events,
config, composition/HMR, and a final chapter registering a tool against
real harness services. Every transcript was produced by running the
chapter files in a gitignored tmp/ scratch directory.

Published to both website locales as mirrored English pages under a new
'Cordis tutorial' develop-sidebar section; a Chinese pair can be added
later without route changes.

website/.vitepress/config.ts

@@ -13,6 +13,7 @@ const sectionOrder = [
   '基础',
   '框架能力',
   '实战',
+  'Cordis 教程',
   '概念',
   '生成参考',
   'Cordis API',
@@ -22,6 +23,7 @@ const sectionOrder = [
   'Basics',
   'Framework',
   'Practice',
+  'Cordis tutorial',
   'Concepts',
   'Generated reference',
   'Cordis Core API',

website/docs.ts

@@ -206,6 +206,26 @@ const develop = pairedPages([
   },
 ])
 
+const cordisTutorial = mirroredPages(([
+  ['index.md', 'Cordis 教程', 'Cordis tutorial'],
+  ['01-first-plugin.md', '1. 第一个插件', '1. Your first plugin'],
+  ['02-lifecycle-and-effects.md', '2. 生命周期与副作用', '2. Lifecycle and effects'],
+  ['03-services.md', '3. 服务', '3. Services'],
+  ['04-events.md', '4. 事件', '4. Events'],
+  ['05-config.md', '5. 配置', '5. Configuration'],
+  ['06-composition-and-hmr.md', '6. 组合与热重载', '6. Composition and HMR'],
+  ['07-into-the-harness.md', '7. 进入 Harness', '7. Into the harness'],
+] as const).map(([file, rootLabel, enLabel], order): MirroredPage => ({
+  source: `docs/cordis-tutorial/${file}`,
+  route: `develop/cordis-tutorial/${file}`,
+  contentLocale: 'en-US',
+  label: { root: rootLabel, en: enLabel },
+  sidebar: { root: 'zh-develop', en: 'en-develop' },
+  section: { root: 'Cordis 教程', en: 'Cordis tutorial' },
+  order,
+  ...(file === 'index.md' ? { sourceAliases: ['docs/cordis-tutorial'] } : {}),
+})))
+
 const reference = mirroredPages([
   ...([
     ['docs/architecture.md', 'reference/index.md', '架构', 'Architecture'],
@@ -301,5 +321,6 @@ const reference = mirroredPages([
 export const docsPages: DocsPage[] = [
   ...homeAndGuide,
   ...develop,
+  ...cordisTutorial,
   ...reference,
 ]