Reorganize project structure and migrate CI to Forgejo

Move all files from deploy/ to project root, replace .gitlab-ci.yml
with .forgejo/workflows/deploy.yml using Gitea Actions format.

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

public/.htaccess

@@ -0,0 +1,12 @@
+# Activer le moteur de réécriture
+RewriteEngine On
+
+# Rediriger toutes les requêtes vers index.php
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteRule ^(.*)$ index.php [QSA,L]
+
+# Sécurité
+<Files ".env">
+    Require all denied
+</Files>