Clean templates, add Caddy dev, Ansible and Gitea config

- Reset templates: clean base.html.twig + new email base template
- Remove old templates (account, legal, security, emails, etc.)
- Add Caddy service to docker-compose-dev
- Add ansible hosts.ini for production deployment
- Add .gitea/CODEOWNERS
- Clean app.scss

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

.gitea/CODEOWNERS

@@ -0,0 +1 @@
+* contact@e-cosplay.fr