feat: 實作系統操作手冊模組 (Markdown 渲染與導覽)

app/Modules/System/Routes/web.php

@@ -0,0 +1,9 @@
+<?php
+
+use Illuminate\Support\Facades\Route;
+use App\Modules\System\Controllers\ManualController;
+
+Route::middleware(['auth'])->group(function () {
+    // 系統管理 - 操作手冊
+    Route::get('/system/manual/{slug?}', [ManualController::class, 'index'])->name('system.manual.index');
+});