feat(docker): ajout service frontend Flutter Web (Nginx port 3001)

- frontend/Dockerfile : build multi-étapes (Flutter stable → Nginx alpine)
- frontend/nginx.conf : SPA routing, cache assets, gzip
- docker-compose.yml : service frontend sur port 3001
- Accessible via reverse proxy → https://app.rayhan.bolbol.tn

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

docker-compose.yml

@@ -44,6 +44,15 @@ services:
     networks:
       - rayhan-net
 
+  frontend:
+    build: ./frontend
+    container_name: rayhan-frontend
+    restart: unless-stopped
+    ports:
+      - "3001:80"
+    networks:
+      - rayhan-net
+
 volumes:
   mysql_data:
 

frontend/Dockerfile

@@ -0,0 +1,13 @@
+# Étape 1 : Build Flutter Web
+FROM ghcr.io/cirruslabs/flutter:stable AS build
+WORKDIR /app
+COPY pubspec.yaml pubspec.lock* ./
+RUN flutter pub get
+COPY . .
+RUN flutter build web --release --base-href /
+
+# Étape 2 : Serveur Nginx
+FROM nginx:alpine
+COPY --from=build /app/build/web /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80

frontend/nginx.conf

@@ -0,0 +1,20 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Flutter Web : toutes les routes pointent vers index.html (SPA)
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache des assets statiques
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json;
+}