chore: initial commit of sso-mock SSO login service

Next.js + Mantine mock SSO service providing account/password, phone
verify-code, and Feishu QR login. Issues a one-time sso_code that the
external app exchanges for user info.

Includes:
- Feishu callback fix: guard against duplicate/concurrent /api/login
  submissions of the same single-use authorization code (feishuLogin
  once-guard + memoized onLoginSuccess to stop effect re-fire).
- ADAPTATION_GUIDE.md: how to switch from the in-memory code store to
  the real backend auth/index + inner_get_user_info endpoints.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/getVerifyCode/route.ts

@@ -0,0 +1,50 @@
+import { NextResponse } from 'next/server'
+
+/**
+ * 代理 uirefbase 的发送验证码接口
+ * uirefbase 路由: POST /api/front/protect/sendVerifyCode
+ * 真实后端: POST /api/v1/basis/user/phone/code
+ * 与 uirefbase 的 requestBasis 保持一致：直接 fetch，无 SDK
+ */
+const SHARED_API = (
+  process.env.NEXT_PUBLIC_SHARED_API_PATH || 'http://172.16.115.31:6610'
+).replace(/\/+$/, '')
+
+export async function POST(req: Request) {
+  const body = await req.json()
+  const fetchUrl = `${SHARED_API}/api/v1/basis/user/phone/code`
+  console.log('[sso-mock] getVerifyCode →', fetchUrl, '| phone:', body?.phone)
+
+  try {
+    const res = await fetch(fetchUrl, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(body),
+    })
+
+    const text = await res.text()
+    let data: any = {}
+    if (text) {
+      try {
+        data = JSON.parse(text)
+      } catch {
+        data = { message: text }
+      }
+    }
+
+    if (res.status !== 200) {
+      return NextResponse.json(
+        { code: 500, message: data?.message || data?.msg || '验证码发送失败' },
+        { status: res.status }
+      )
+    }
+
+    return NextResponse.json(data, { status: 200 })
+  } catch (err: any) {
+    console.error('[sso-mock] getVerifyCode error:', err.message)
+    return NextResponse.json(
+      { code: 500, message: err?.message || '验证码发送失败' },
+      { status: 500 }
+    )
+  }
+}