fix(meetings): 删 MeetingNew 死代码 import (useUserStore 实际未用, 路径错)

commit 996ac13 加了 import { useUserStore } from '@/store/modules/user'
+ const userStore = useUserStore(), 但:
- 实际 userStore 在文件里完全没被引用 (roleSegment 直接走 route.path.split('/'))
- import 路径错了: 真实路径是 @/store/user, 不是 @/store/modules/user
  (src/store/ 下只有 user.js, 没有 modules/ 子目录)

上次 commit e68476e 把 MeetingNew 挪到 views/meetings/ 后, Vite import-analysis
触发解析错误: '@/store/modules/user does the file exist?'

修法: 直接删 import + userStore 声明 (本来就没用).
roleSegment/isAdmin 仍然从 route.path 算, 不依赖 store.

为什么 996ac13 时没暴露:
- 用户没在那个 commit 后跑过 npm run dev
- e68476e 的 git mv 让 vite 重新分析 import, 才报出来

ry-vue3/src/views/meetings/MeetingNew.vue

@@ -57,7 +57,6 @@
 <script setup>
 import { ref, reactive, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { useUserStore } from '@/store/modules/user'
 import { bizAdd, bizGet, bizUpdate } from '@/api/public'
 import { ElMessage } from 'element-plus'
 
@@ -65,7 +64,6 @@ const route = useRoute()
 const router = useRouter()
 
 // ========== 角色感知 (admin/manager 共用此新建页, 按 URL 第 1 段识别) ==========
-const userStore = useUserStore()
 const roleSegment = computed(() => route.path.split('/')[1])  // 'admin' | 'manager'
 const isAdmin = computed(() => roleSegment.value === 'admin')
 const meetingsBase = computed(() => `/${roleSegment.value}/meetings`)