fix: add proper Dockerfiles for backend and frontend, simplify docker-compose

frontend/Dockerfile

@@ -1,49 +1,34 @@
-# Build stage
 FROM node:20-alpine AS builder
 
 WORKDIR /app
 
-# Copy package files
 COPY package*.json ./
-
-# Install dependencies
 RUN npm ci
 
-# Copy source code
 COPY . .
 
-# Build the app
 RUN npm run build
 
-# Production stage - use nginx for serving
 FROM nginx:alpine
 
-# Copy nginx config
-RUN echo 'server {\n\
-  listen 3000;\n\
-  server_name _;\n\
-  root /usr/share/nginx/html;\n\
-  index index.html;\n\
-  \n\
-  location / {\n\
-    try_files $uri $uri/ /index.html;\n\
-  }\n\
-  \n\
-  location ~* \\.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {\n\
-    expires 1y;\n\
-    add_header Cache-Control "public, immutable";\n\
-  }\n\
-}' > /etc/nginx/conf.d/default.conf
-
-# Copy built app from builder
 COPY --from=builder /app/dist /usr/share/nginx/html
 
-# Expose port
-EXPOSE 3000
+COPY <<'EOF' /etc/nginx/conf.d/default.conf
+server {
+  listen 3579;
+  server_name _;
+  root /usr/share/nginx/html;
 
-# Health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
-  CMD wget --quiet --tries=1 --spider http://localhost:3000/ || exit 1
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+
+  location /api {
+    proxy_pass http://backend:5000;
+  }
+}
+EOF
+
+EXPOSE 3579
 
-# Start nginx
 CMD ["nginx", "-g", "daemon off;"]