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>

.gitignore

@@ -1,21 +1,30 @@
+###> symfony/framework-bundle ###
+/.env.local
+/.env.local.php
+/.env.*.local
+/config/secrets/prod/prod.decrypt.private.php
+/public/bundles/
+/var/
+/vendor/
+###< symfony/framework-bundle ###
+
+###> phpunit/phpunit ###
+/phpunit.xml
+/.phpunit.cache/
+###< phpunit/phpunit ###
+
 # PlatformIO build artifacts
-.pio/
+firmware/.pio/
 
-# Environment overrides
-.env.local
-.env.*.local
-
-# Symfony runtime
-var/
+# User-uploaded image storage
 storage/images/
 
-# Composer
-vendor/
-
-# macOS
+# macOS / IDE
 .DS_Store
-
-# IDE
 .idea/
 .vscode/
 *.swp
+
+# Frontend build
+/public/build/
+/frontend/node_modules/