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>

frontend/src/components/layout/TabBar.module.css

@@ -0,0 +1,36 @@
+.tabBar {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  z-index: 100;
+  display: flex;
+  height: 50px;
+  padding-bottom: env(safe-area-inset-bottom);
+  background: #fff;
+  border-top: 1px solid #eee;
+}
+
+.tab {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 2px;
+  color: #999;
+  cursor: pointer;
+  transition: color 0.2s;
+}
+
+.tab.active {
+  color: #1677ff;
+}
+
+.icon {
+  font-size: 22px;
+}
+
+.label {
+  font-size: 11px;
+}