feat(agent,server): v0.2.7 - mu-plugin WordPress robuste, réparation wp-config, proxy cookies/headers

- Agent: mu-plugin embarqué amélioré (HTTPS forcé, filtres URL, localhost:port)
- Agent: suppression des WP_HOME/WP_SITEURL hardcodés au démarrage des instances
- Server/proxy: envoi X-Forwarded-Port, réécriture headers/body élargie
- Server/proxy: sanitization des Set-Cookie (Secure, SameSite, Domain)
- Dashboard: version agent 0.2.7, action Supprimer complète
- Cleanup: binaires agent 0.2.3-0.2.6 remplacés par 0.2.7

server/prisma/seed.ts

@@ -101,9 +101,7 @@ async function main() {
       WORDPRESS_DB_USER: ${t.dbUser}
       WORDPRESS_DB_PASSWORD: ${t.dbPassword}
       WORDPRESS_DB_PREFIX: wp_
-      WORDPRESS_CONFIG_EXTRA: |
-        define('WP_HOME', '{PUBLIC_URL}');
-        define('WP_SITEURL', '{PUBLIC_URL}');
+      # No hardcoded WP_HOME/WP_SITEURL so WordPress auto-detects from the Host header
       PS_DB_HOST: ${dbHost}:${dbPort}
       PS_DB_NAME: ${t.dbName}
       PS_DB_USER: ${t.dbUser}
@@ -118,6 +116,7 @@ async function main() {
         condition: service_healthy
     volumes:
       - app_data:/var/www/html
+      - {MU_PLUGINS_DIR}/edubox-public-url.php:/var/www/html/wp-content/mu-plugins/edubox-public-url.php:ro
     restart: unless-stopped
 volumes:
   db_data: