chore: seal Design Vision v1 and monorepo scaffold

Archive the differentiated YuXinGu product docs, AI engineering system,
design contract, and Go/Vue scaffold. Next execution prioritizes Cece-parity
over early innovation (see .ai/product/STRATEGY.md).

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/mini-program/README.md

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+# mini-program
+
+微信小程序客户端（业务后置）。
+
+## 接入约定
+
+1. 使用 `packages/sdk` 的 `createClient`，注入微信适配器：
+
+```ts
+// 伪代码
+createClient({
+  baseURL: 'https://api.example.com',
+  adapters: {
+    request: (opts) => wxRequestToApiResponse(opts),
+    getToken: () => wx.getStorageSync('yxg_token') || null,
+  },
+})
+```
+
+2. 页面禁止直接 `wx.request`；统一 `services/*`。
+3. 类型复用 `@yuxingu/types`；UI 组件不与 Vue H5 共享 SFC，只共享 `packages/ui` token。
+
+详见 `apps/docs/standards/06-mini-program.md`。

apps/mini-program/app.js

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+App({
+  onLaunch() {
+    // scaffold only
+  },
+})

apps/mini-program/app.json

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+{
+  "pages": ["pages/home/index"],
+  "window": {
+    "navigationBarTitleText": "愈心谷",
+    "navigationBarBackgroundColor": "#FFD1C7",
+    "navigationBarTextStyle": "black"
+  }
+}

apps/mini-program/pages/home/index.js

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+Page({})

apps/mini-program/pages/home/index.json

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+{
+  "usingComponents": {}
+}

apps/mini-program/pages/home/index.wxml

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+<view class="wrap">愈心谷小程序脚手架 — 业务后置</view>

apps/mini-program/pages/home/index.wxss

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+.wrap{padding:24px;color:#666;font-size:14px}