feat: [claude-code] SAM 활용방안 페이지 추가

- 컨트롤러, 뷰, 라우트 생성
- 7개 섹션: 핵심요약, Before/After, 프로세스플로우, 80%공통화론, 멀티테넌시, AI자동화, 로드맵
- HX-Redirect 패턴 적용

app/Http/Controllers/ClaudeCode/UsagePlanController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Controllers\ClaudeCode;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Illuminate\View\View;
+
+class UsagePlanController extends Controller
+{
+    public function index(Request $request): View|Response
+    {
+        if ($request->header('HX-Request')) {
+            return response('', 200)->header('HX-Redirect', route('claude-code.usage-plan.index'));
+        }
+
+        return view('claude-code.usage-plan.index');
+    }
+}