Add application source code, configs and assets

- Controllers, Entity, Repository, Services, Twig extensions
- Templates (account, emails, home, legal, security, unsubscribe)
- Symfony config updates (bundles, security, framework, services)
- Vite + Bun setup with PostCSS
- Caddy config, CLAUDE.md, README
- Update .gitignore (node_modules, .idea, cert)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1,4 +1,3 @@
-
 ###> symfony/framework-bundle ###
 /.env.local
 /.env.local.php
@@ -14,7 +13,6 @@
 /.phpunit.cache/
 ###< phpunit/phpunit ###
 
-###> symfony/asset-mapper ###
-/public/assets/
-/assets/vendor/
-###< symfony/asset-mapper ###
+node_modules/
+.idea/
+cert/