feat(web): 统一平台管理员判定与 AI 工作台申请预览动作接入

- authUser 抽出 resolveAuthUserAdminFlag，统一 isAdmin 解析（含 superadmin、role_codes、中英文角色名），accessControl 复用同一逻辑
- 登录态、应用外壳路由、系统状态接入统一管理员判定，LoginView 与相关 composable 配套调整
- AI 工作台申请提交改为调用新的 /application-preview-action 接口，草稿保存仍走 orchestrator；预审模型补充重叠冲突提示与阻断判断
- 同步更新 accessControl/api-request/ai 预览动作等前端测试

web/src/services/api.js

@@ -1,4 +1,4 @@
-import { normalizeAuthUserSnapshot } from '../utils/authUser.js'
+import { normalizeAuthUserSnapshot, resolveAuthUserAdminFlag } from '../utils/authUser.js'
 
 const API_BASE_STORAGE_KEY = 'x-financial-api-base-url'
 const AUTH_USER_STORAGE_KEY = 'x-financial-auth-user'
@@ -49,7 +49,7 @@ function readCurrentUserHeaders() {
     const username = user.username
     const name = user.name || username
     const roleCodes = user.roleCodes
-    const isAdmin = resolveStoredUserAdminFlag(payload, roleCodes)
+    const isAdmin = resolveAuthUserAdminFlag(payload, roleCodes)
     const department = user.department || user.departmentName
     const costCenter = user.costCenter
     const position = user.position
@@ -112,22 +112,7 @@ function readCurrentUserHeaders() {
   }
 }
 
-function resolveStoredUserAdminFlag(payload, roleCodes = []) {
-  const username = String(payload?.username || payload?.account || '').trim().toLowerCase()
-  const role = String(payload?.role || '').trim().toLowerCase()
-  const normalizedRoleCodes = roleCodes.map((item) => String(item || '').trim().toLowerCase()).filter(Boolean)
-
-  return (
-    Boolean(payload?.isAdmin)
-    || username === 'admin'
-    || role === 'admin'
-    || role === '管理员'
-    || role === '系统管理员'
-    || normalizedRoleCodes.includes('admin')
-  )
-}
-
-function normalizeApiBaseUrl(value) {
+function normalizeApiBaseUrl(value) {
   return String(value || '/api/v1').replace(/\/$/, '')
 }