chore: stage all in-progress work before repo split

Web app: new entities (Image, RenderedAsset, SharedImage, Token,
DeviceImageHistory), enums, repositories, controllers, message handlers,
migrations, tests, frontend upload/library/sticker UI, Vue components.

Firmware: EPD background screen binaries + gen scripts, setup_bg header.

Infra: ddev config, test bundle, gitignore coverage dir.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Integration/ScheduleTest.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Integration;
+
+use App\Schedule;
+use App\Tests\AppKernelTestCase;
+use Symfony\Component\Scheduler\Schedule as SymfonySchedule;
+
+class ScheduleTest extends AppKernelTestCase
+{
+    public function test_schedule_returns_schedule_with_recurring_message(): void
+    {
+        $cache    = static::getContainer()->get('cache.app');
+        $schedule = new Schedule($cache);
+        $result   = $schedule->getSchedule();
+
+        $this->assertInstanceOf(SymfonySchedule::class, $result);
+    }
+}