feat: 默认昵称带序号（星辰旅行者1001 起步，跳过占用），与画屿画友方案一致，纯后端无需发版

server/src/routes/auth.js

@@ -1,5 +1,19 @@
 const express = require('express')
 const router = express.Router()
+
+/**
+ * 生成默认昵称：星辰旅行者 + 序号（1001 起步，跳过已占用，参考画屿画友1001 方案）
+ */
+async function genDefaultNickName() {
+  const used = new Set(
+    (await User.find({ nickName: /^星辰旅行者\d+$/ }).select('nickName').lean())
+      .map(u => parseInt(String(u.nickName).replace('星辰旅行者', ''), 10))
+      .filter(n => !isNaN(n))
+  )
+  let n = 1001
+  while (used.has(n)) n++
+  return `星辰旅行者${n}`
+}
 const jwt = require('jsonwebtoken')
 const { User, Admin, AdminLog, LoginLog, VerificationCode } = require('../models')
 const ApiResponse = require('../utils/response')
@@ -107,7 +121,7 @@ router.post('/login', async (req, res) => {
       // 新用户
       user = new User({
         openid,
-        nickName: userInfo?.nickName || '星辰旅行者',
+        nickName: userInfo?.nickName || (await genDefaultNickName()),
         avatarUrl: userInfo?.avatarUrl || '',
         unlockedDims: [1]
       })
@@ -195,7 +209,7 @@ router.post('/webview-login', async (req, res) => {
       // 新用户 - 使用微信提供的信息创建账户
       user = new User({
         openid,
-        nickName: userInfo?.nickName || '星辰旅行者',
+        nickName: userInfo?.nickName || (await genDefaultNickName()),
         avatarUrl: userInfo?.avatarUrl || '',
         unlockedDims: [1]
       })
@@ -479,7 +493,7 @@ router.post('/user/register', async (req, res) => {
       username: finalUsername,
       email: email || '',
       password,
-      nickName: nickName || '星辰旅行者',
+      nickName: nickName || (await genDefaultNickName()),
       avatarUrl: avatarUrl || '',
       unlockedDims: [1]
     })