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>

migrations/Version20260506200000.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260506200000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Rename rotation_interval_hours to rotation_interval_minutes (1 hour = 60 minutes)';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE device RENAME COLUMN rotation_interval_hours TO rotation_interval_minutes');
+        $this->addSql('ALTER TABLE device ALTER COLUMN rotation_interval_minutes SET DEFAULT 1440');
+        $this->addSql('UPDATE device SET rotation_interval_minutes = rotation_interval_minutes * 60');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('UPDATE device SET rotation_interval_minutes = rotation_interval_minutes / 60');
+        $this->addSql('ALTER TABLE device ALTER COLUMN rotation_interval_minutes SET DEFAULT 24');
+        $this->addSql('ALTER TABLE device RENAME COLUMN rotation_interval_minutes TO rotation_interval_hours');
+    }
+}