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/composables/useAppShell.js

@@ -158,6 +158,10 @@ export function useAppShell() {
     ].some((value) => String(value || '').trim() === normalizedId)
   }
 
+  function isDetailLookupOnlyPayload(payload = {}) {
+    return Boolean(payload?.detailLookupOnly || payload?.detail_lookup_only)
+  }
+
   function resolveRequestDetailLookupId(requestOrId = selectedRequestSnapshot.value) {
     if (typeof requestOrId === 'string') {
       return requestOrId.trim()
@@ -168,6 +172,8 @@ export function useAppShell() {
       || requestOrId?.id
       || requestOrId?.claimNo
       || requestOrId?.claim_no
+      || requestOrId?.documentNo
+      || requestOrId?.document_no
       || ''
     ).trim()
   }
@@ -564,13 +570,18 @@ export function useAppShell() {
   }
 
   function openRequestDetail(request, options = {}) {
-    selectedRequestSnapshot.value = request || null
+    const requestId = resolveRequestDetailLookupId(request)
+    if (!requestId) {
+      return
+    }
+    const isDetailLookupOnlyRequest = isDetailLookupOnlyPayload(request)
+    selectedRequestSnapshot.value = isDetailLookupOnlyRequest ? null : request || null
     router.push({
       name: 'app-document-detail',
-      params: { requestId: request.claimId || request.id },
+      params: { requestId },
       query: buildDocumentDetailQuery(options)
     })
-    void refreshSelectedRequestDetail(request)
+    void refreshSelectedRequestDetail(isDetailLookupOnlyRequest ? requestId : request)
   }
 
   function closeRequestDetail() {