docs: ajout de la documentation pour le déploiement

DEPLOYMENT.md

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+# Deploiement Frontend Next.js
+
+Guide de deploiement du frontend Next.js sur un serveur Ubuntu.
+
+## Prerequis
+
+- Ubuntu 20.04+ / Debian 11+
+- Acces root ou sudo
+- Node.js 20+
+- Backend Directus deploye (ex: `api.exemple.com`)
+- Nom de domaine configure (ex: `exemple.com`)
+
+## 1. Installation des dependances
+
+```bash
+sudo apt update && sudo apt upgrade -y
+
+# Node.js 22 LTS
+curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -
+sudo apt install -y nodejs
+
+# Yarn et PM2
+sudo npm install -g yarn pm2
+
+# Nginx et Certbot
+sudo apt install -y nginx certbot python3-certbot-nginx
+```
+
+## 2. Configuration du projet
+
+```bash
+# Cloner le projet
+git clone <URL_DU_REPO> frontend
+cd frontend
+
+# Configurer l'environnement
+cp .env.sample .env
+nano .env
+```
+
+Variables a modifier dans `.env`:
+
+```env
+DIRECTUS_API_URL=https://api.exemple.com
+DIRECTUS_API_WS_URL=wss://api.exemple.com/websocket
+
+NEXTAUTH_URL=https://exemple.com
+NEXTAUTH_SECRET=<openssl rand -base64 32>
+
+NEXT_PUBLIC_URL=https://exemple.com
+NEXT_PUBLIC_DIRECTUS_API_URL=https://api.exemple.com
+NEXT_PUBLIC_DIRECTUS_API_WS_URL=wss://api.exemple.com/websocket
+```
+
+## 3. Build de production
+
+```bash
+yarn install --frozen-lockfile
+yarn build
+```
+
+## 4. Demarrage avec PM2
+
+```bash
+pm2 start yarn --name "frontend" -- start
+pm2 status
+
+# Demarrage automatique au boot
+pm2 startup
+pm2 save
+```
+
+## 5. Configuration Nginx
+
+```bash
+sudo nano /etc/nginx/sites-available/exemple.com
+```
+
+```nginx
+server {
+    listen 80;
+    listen [::]:80;
+    server_name exemple.com;
+
+    client_max_body_size 10M;
+
+    access_log /var/log/nginx/exemple.com.access.log;
+    error_log /var/log/nginx/exemple.com.error.log;
+
+    location / {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_cache_bypass $http_upgrade;
+        proxy_connect_timeout 60;
+        proxy_send_timeout 60;
+        proxy_read_timeout 60;
+    }
+
+    location /_next/static {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_cache_valid 60m;
+        add_header Cache-Control "public, immutable, max-age=31536000";
+    }
+}
+```
+
+Activer le site:
+
+```bash
+sudo ln -s /etc/nginx/sites-available/exemple.com /etc/nginx/sites-enabled/
+sudo nginx -t && sudo systemctl reload nginx
+```
+
+## 6. Certificat SSL
+
+Verifier le DNS:
+
+```bash
+dig +short exemple.com
+curl -4 ifconfig.me
+```
+
+Obtenir le certificat:
+
+```bash
+sudo certbot --nginx -d exemple.com
+```
+
+## 7. Verification
+
+Ouvrir `https://exemple.com` dans un navigateur.
+
+## Commandes utiles
+
+```bash
+# Logs PM2
+pm2 logs frontend
+
+# Statut
+pm2 status
+
+# Redemarrer
+pm2 restart frontend
+
+# Mise a jour
+git pull origin main
+yarn install --frozen-lockfile
+yarn build
+pm2 restart frontend
+```
+
+## Troubleshooting
+
+### L'application ne demarre pas
+
+```bash
+pm2 logs frontend --lines 50
+ls -la .next/
+yarn start
+```
+
+### Erreur 502
+
+```bash
+pm2 status
+curl http://localhost:3000
+sudo tail -20 /var/log/nginx/exemple.com.error.log
+```
+
+### Erreur de connexion API
+
+```bash
+curl https://api.exemple.com/server/health
+cat .env | grep DIRECTUS
+```
+
+### Erreur SSL
+
+```bash
+dig +short exemple.com
+sudo certbot certificates
+sudo certbot renew --force-renewal
+```
+
+## Configuration CORS Backend
+
+Verifier que le backend autorise le frontend dans son `.env`:
+
+```env
+CORS_ENABLED=true
+CORS_ORIGIN=true
+```