fix: Docker Compose configuration fixes

- Fix frontend Dockerfile reference (Dockerfile not Dockerfile.frontend)
- Remove obsolete 'version' attribute from docker-compose.yml
- Add --legacy-peer-deps to npm ci in frontend Dockerfile

Docker build now works correctly.

frontend/Dockerfile

@@ -9,7 +9,7 @@ WORKDIR /app
 COPY package*.json ./
 
 # Install dependencies
-RUN npm ci
+RUN npm ci --legacy-peer-deps
 
 # Copy source code
 COPY . .