chore: 删除e2e测试相关的初始化文件和快照文件

清理不再需要的测试初始化文件和视觉回归测试的快照文件，以保持代码库整洁

src/app/admin/login/simple-page.tsx

@@ -1,37 +0,0 @@
-export default function SimpleLoginPage() {
-  return (
-    <div className="min-h-screen flex items-center justify-center bg-gray-50">
-      <div className="bg-white p-8 rounded-lg shadow-md">
-        <h1 className="text-2xl font-bold mb-4">管理后台登录</h1>
-        <form className="space-y-4">
-          <div>
-            <label htmlFor="email" className="block text-sm font-medium mb-1">邮箱</label>
-            <input
-              id="email"
-              type="email"
-              name="email"
-              className="w-full px-3 py-2 border rounded-md"
-              placeholder="admin@novalon.cn"
-            />
-          </div>
-          <div>
-            <label htmlFor="password" className="block text-sm font-medium mb-1">密码</label>
-            <input
-              id="password"
-              type="password"
-              name="password"
-              className="w-full px-3 py-2 border rounded-md"
-              placeholder="admin123456"
-            />
-          </div>
-          <button
-            type="submit"
-            className="w-full bg-[#C41E3A] text-white py-2 rounded-md hover:bg-[#A01828]"
-          >
-            登录
-          </button>
-        </form>
-      </div>
-    </div>
-  );
-}

src/app/admin/simple/page.tsx

@@ -1,10 +0,0 @@
-export default function SimpleAdminPage() {
-  return (
-    <div className="min-h-screen flex items-center justify-center">
-      <div className="text-center">
-        <h1 className="text-2xl font-bold">Simple Admin Page</h1>
-        <p className="mt-4">这是一个简单的admin页面，不依赖任何认证</p>
-      </div>
-    </div>
-  );
-}

src/app/admin/test/page.tsx

@@ -1,10 +0,0 @@
-export default function AdminTestPage() {
-  return (
-    <div className="min-h-screen flex items-center justify-center">
-      <div className="text-center">
-        <h1 className="text-2xl font-bold">Admin Test Page</h1>
-        <p className="mt-4">如果你看到这个页面，说明admin路由是工作的</p>
-      </div>
-    </div>
-  );
-}