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>

config/packages/web_profiler.yaml

@@ -0,0 +1,13 @@
+when@dev:
+    web_profiler:
+        toolbar: true
+
+    framework:
+        profiler:
+            collect_serializer_data: true
+
+when@test:
+    framework:
+        profiler:
+            collect: false
+            collect_serializer_data: true