feat: 앱 버전 관리 페이지 구현

- AppVersion 모델, Service, Controller
- 버전 등록 폼 (APK 업로드, 강제 업데이트 설정)
- 버전 목록 테이블 (활성 토글, 다운로드 수, 삭제)
- /app-versions 라우트 추가
- app_releases 스토리지 디스크 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/Http/Controllers/AppVersionController.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Services\AppVersionService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class AppVersionController extends Controller
+{
+    public function __construct(
+        private readonly AppVersionService $appVersionService
+    ) {}
+
+    /**
+     * 버전 목록 + 등록 폼
+     */
+    public function index(Request $request): View
+    {
+        $versions = $this->appVersionService->list();
+
+        return view('app-versions.index', compact('versions'));
+    }
+
+    /**
+     * 새 버전 등록
+     */
+    public function store(Request $request): RedirectResponse
+    {
+        $request->validate([
+            'version_code' => 'required|integer|min:1|unique:app_versions,version_code',
+            'version_name' => 'required|string|max:20',
+            'platform' => 'required|in:android,ios',
+            'release_notes' => 'nullable|string',
+            'force_update' => 'nullable|boolean',
+            'apk_file' => 'nullable|file|max:204800', // 200MB
+        ]);
+
+        $this->appVersionService->store(
+            $request->only(['version_code', 'version_name', 'platform', 'release_notes', 'force_update']),
+            $request->file('apk_file')
+        );
+
+        return redirect()->route('app-versions.index')
+            ->with('success', '새 버전이 등록되었습니다.');
+    }
+
+    /**
+     * 활성 토글
+     */
+    public function toggleActive(int $id): RedirectResponse
+    {
+        $version = $this->appVersionService->toggleActive($id);
+        $status = $version->is_active ? '활성화' : '비활성화';
+
+        return redirect()->route('app-versions.index')
+            ->with('success', "v{$version->version_name}이 {$status}되었습니다.");
+    }
+
+    /**
+     * 삭제
+     */
+    public function destroy(int $id): RedirectResponse
+    {
+        $this->appVersionService->destroy($id);
+
+        return redirect()->route('app-versions.index')
+            ->with('success', '버전이 삭제되었습니다.');
+    }
+}