Add CMS module

Static content pages (CmsPage) manageable from a new Filament resource and
readable via a public API endpoint. Wired into the admin panel with its own
CmsPlugin and "CMS" navigation group.

app-modules/cms/src/Http/Controllers/CmsPageController.php

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+<?php
+
+namespace Modules\Cms\Http\Controllers;
+
+use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
+use Illuminate\Routing\Controller;
+use Modules\Cms\Http\Resources\CmsPageResource;
+use Modules\Cms\Models\CmsPage;
+
+class CmsPageController extends Controller
+{
+    public function index(): AnonymousResourceCollection
+    {
+        return CmsPageResource::collection(
+            CmsPage::query()->where('is_active', true)->paginate()
+        );
+    }
+
+    public function show(string $page): CmsPageResource
+    {
+        $cmsPage = CmsPage::query()
+            ->where('page', $page)
+            ->where('is_active', true)
+            ->firstOrFail();
+
+        return new CmsPageResource($cmsPage);
+    }
+}

app-modules/cms/src/Http/Resources/CmsPageResource.php

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+<?php
+
+namespace Modules\Cms\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class CmsPageResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'page' => $this->page,
+            'title' => $this->title,
+            'mm_title' => $this->mm_title,
+            'meta_tags' => $this->meta_tags,
+            'meta_keywords' => $this->meta_keywords,
+            'content' => $this->content,
+            'mm_content' => $this->mm_content,
+        ];
+    }
+}