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/database/migrations/2026_08_25_000000_create_cms_pages_table.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('cms_pages', function (Blueprint $table) {
+            $table->id();
+            $table->string('page')->unique();
+            $table->string('title');
+            $table->string('mm_title');
+            $table->string('meta_tags')->nullable();
+            $table->string('meta_keywords')->nullable();
+            $table->longText('content')->nullable();
+            $table->longText('mm_content')->nullable();
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('cms_pages');
+    }
+};