feat(P19AI1-1,P19AI1-2): 实现AI建议引擎与权限门禁后端

server/src/constants/permissions.js

@@ -139,6 +139,7 @@ const ROLE_PERMISSIONS = {
     "budget.manage",
     "integration.manage",
     "notification.channel.manage",
+    "ai.assist",
     "expense.approve",
     "expense.finance.pay",
     "expense.view_all",