feat: [system] 운영서버 Git 동작원리 페이지 추가

- SystemGuideController 생성 (HX-Redirect 패턴)
- git-deploy-flow.blade.php 뷰 생성 (아카데미 형식 참고)
- 라우트: /system/git-deploy-flow

app/Http/Controllers/System/SystemGuideController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Controllers\System;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Illuminate\View\View;
+
+class SystemGuideController extends Controller
+{
+    public function gitDeployFlow(Request $request): View|Response
+    {
+        if ($request->header('HX-Request')) {
+            return response('', 200)->header('HX-Redirect', route('system.guide.git-deploy-flow'));
+        }
+
+        return view('system.git-deploy-flow');
+    }
+}