feat: ajout Docker Compose et documentation outils

- Dockerfile backend (Python 3.11 + Poetry + Playwright/Chromium)
- Dockerfile frontend (Node 20 + Vite build + Nginx)
- docker-compose.yml avec services et volumes persistants
- Proxy Nginx pour API (/api -> backend:8008)
- Healthchecks sur les deux services
- Configuration Docker (.env.docker, .dockerignore)
- Documentation déploiement Docker dans README
- Fichier docs/tools_used.md avec liste des technologies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker/frontend/nginx.conf

@@ -0,0 +1,47 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+    resolver 127.0.0.11 ipv6=off valid=10s;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_proxied expired no-cache no-store private auth;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml;
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # SPA fallback - toutes les routes vers index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Proxy vers le backend API
+    location /api/ {
+        set $backend_upstream http://backend:8008;
+        rewrite ^/api/(.*)$ /$1 break;
+        proxy_pass $backend_upstream;
+        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;
+    }
+
+    # Health check endpoint
+    location /health {
+        access_log off;
+        return 200 "healthy\n";
+        add_header Content-Type text/plain;
+    }
+}