feat: 创建里程管理占位组件

src/modules/mileage/MileageModule.tsx

@@ -0,0 +1,13 @@
+import { Route } from 'lucide-react';
+
+export default function MileageModule() {
+  return (
+    <div className="min-h-screen bg-[#F8F9FB] flex items-center justify-center p-6">
+      <div className="text-center">
+        <Route size={48} className="mx-auto text-gray-300 mb-4" />
+        <h2 className="text-lg font-semibold text-gray-500">里程管理</h2>
+        <p className="text-sm text-gray-400 mt-2">开发中...</p>
+      </div>
+    </div>
+  );
+}