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/aiApplicationPreviewActions.js

@@ -1,3 +1,4 @@
+import { apiRequest } from './api.js'
 import { runOrchestrator } from './orchestrator.js'
 import {
   buildApplicationPreviewRows,
@@ -126,11 +127,20 @@ export function buildAiApplicationPreviewActionPayload({
 }
 
 export function runAiApplicationPreviewAction(params = {}, options = {}) {
-  return runOrchestrator(buildAiApplicationPreviewActionPayload(params), {
-    timeoutMs: params.actionType === AI_APPLICATION_ACTION_SUBMIT ? 120000 : 75000,
-    timeoutMessage: params.actionType === AI_APPLICATION_ACTION_SUBMIT
-      ? '申请提交处理超时，请稍后重试。'
-      : '申请草稿保存超时，请稍后重试。',
+  const payload = buildAiApplicationPreviewActionPayload(params)
+  if (params.actionType === AI_APPLICATION_ACTION_SUBMIT) {
+    return apiRequest('/reimbursements/application-preview-action', {
+      method: 'POST',
+      body: JSON.stringify(payload),
+      timeoutMs: 45000,
+      timeoutMessage: '申请提交处理超时，请稍后重试。',
+      ...options
+    })
+  }
+
+  return runOrchestrator(payload, {
+    timeoutMs: 75000,
+    timeoutMessage: '申请草稿保存超时，请稍后重试。',
     ...options
   })
 }