szkp-map-service/routes/web.php

<?php

use Illuminate\Support\Facades\Route;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider and all of them will
| be assigned to the "web" middleware group. Make something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

/*
| 后台 Vue SPA（public/admin）：子路径需回退到 index.html，否则刷新 /admin/venues 等会得到 404。
| 静态文件（assets/*）若存在则直出；其余路径统一返回 index.html。
| index 使用字符串响应而非 BinaryFileResponse，避免部分 Nginx + X-Sendfile 配置下返回 500。
*/
Route::get('/admin/{path?}', function (?string $path = null) {
    $adminBase = realpath(public_path('admin'));
    if ($adminBase === false || ! is_dir($adminBase)) {
        abort(503, 'Admin frontend is not deployed (missing public/admin).');
    }

    if ($path !== null && $path !== '') {
        $relative = str_replace(['/', '\\'], DIRECTORY_SEPARATOR, $path);
        $candidate = realpath($adminBase.DIRECTORY_SEPARATOR.$relative);
        if ($candidate !== false
            && str_starts_with($candidate, $adminBase)
            && is_file($candidate)
            && is_readable($candidate)) {
            return response()->file($candidate);
        }
    }

    $index = $adminBase.DIRECTORY_SEPARATOR.'index.html';
    if (! is_file($index) || ! is_readable($index)) {
        abort(503, 'Admin index.html is missing or unreadable.');
    }

    $html = @file_get_contents($index);
    if ($html === false) {
        abort(503, 'Cannot read admin index.html.');
    }

    return response($html, 200, [
        'Content-Type' => 'text/html; charset=UTF-8',
    ]);
})->where('path', '.*');