Initial commit: X-Server Mobile enterprise tool system

- Frontend: React 18 + TypeScript + Vite + Ant Design Mobile
- Backend: PHP 8.5 + Webman 2.x + MySQL + Redis
- i18n support: Chinese, English, Russian, Spanish, French
- Approval workflow engine
- Docker development environment
- Feishu integration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/lang/zh.php

@@ -0,0 +1,75 @@
+<?php
+
+/**
+ * 中文翻译文件
+ */
+return [
+    'app' => [
+        'name' => '企业工具系统',
+        'title' => '企业内部工具平台',
+    ],
+    'common' => [
+        'success' => '操作成功',
+        'error' => '操作失败',
+        'confirm' => '确认',
+        'cancel' => '取消',
+        'submit' => '提交',
+        'save' => '保存',
+        'delete' => '删除',
+        'edit' => '编辑',
+        'search' => '搜索',
+        'refresh' => '刷新',
+        'back' => '返回',
+        'close' => '关闭',
+        'loading' => '加载中...',
+        'no_data' => '暂无数据',
+        'operation' => '操作',
+        'status' => '状态',
+        'create_time' => '创建时间',
+        'update_time' => '更新时间',
+        'remark' => '备注',
+    ],
+    'auth' => [
+        'login_success' => '登录成功',
+        'login_failed' => '登录失败',
+        'username_required' => '用户名不能为空',
+        'password_required' => '密码不能为空',
+        'invalid_credentials' => '用户名或密码错误',
+        'token_expired' => '登录已过期，请重新登录',
+        'unauthorized' => '未授权，请先登录',
+    ],
+    'user' => [
+        'not_found' => '用户不存在',
+        'info_updated' => '个人信息更新成功',
+        'company_switched' => '公司切换成功',
+    ],
+    'approval' => [
+        'submit_success' => '审批提交成功',
+        'approve_success' => '审批通过',
+        'reject_success' => '已拒绝',
+        'cancel_success' => '已撤销',
+        'not_found' => '审批单不存在',
+        'cannot_approve' => '当前状态无法审批',
+        'cannot_cancel' => '当前状态无法撤销',
+        'not_owner' => '只有申请人可以撤销',
+        'status' => [
+            'pending' => '待审批',
+            'approved' => '已通过',
+            'rejected' => '已拒绝',
+            'cancelled' => '已撤销',
+        ],
+    ],
+    'business_trip' => [
+        'submit_success' => '出差申请提交成功',
+        'update_success' => '出差申请更新成功',
+        'not_found' => '出差申请不存在',
+    ],
+    'error' => [
+        'network_error' => '网络错误，请稍后重试',
+        'server_error' => '服务器错误',
+        'not_found' => '页面不存在',
+        'unknown_error' => '未知错误',
+        'params_error' => '参数错误',
+        'validation_error' => '数据验证失败',
+    ],
+];