feat(story-1.1): scaffold Symfony 7.4 LTS app with DDEV, Messenger, Scheduler

- DDEV config: PHP 8.4, PostgreSQL 16, nginx-fpm, Imagick via webimage_extra_packages
- Symfony 7.4 LTS skeleton + webapp pack scaffolded via Composer
- Removed AssetMapper, Stimulus, UX-Turbo (replaced by Vue 3 SPA per architecture)
- Added symfony/messenger + symfony/scheduler (Doctrine transport)
- Gitea CI workflow: PHP 8.4 container + PostgreSQL 16 service, runs phpunit

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

compose.override.yaml

@@ -0,0 +1,18 @@
+
+services:
+###> doctrine/doctrine-bundle ###
+  database:
+    ports:
+      - "5432"
+###< doctrine/doctrine-bundle ###
+
+###> symfony/mailer ###
+  mailer:
+    image: axllent/mailpit
+    ports:
+      - "1025"
+      - "8025"
+    environment:
+      MP_SMTP_AUTH_ACCEPT_ANY: 1
+      MP_SMTP_AUTH_ALLOW_INSECURE: 1
+###< symfony/mailer ###