chore(docker): update ports and switch frontend to serve static files

- Change frontend port from 80 to 8847 and backend port from 3001 to 9173 in .env.example
- Replace nginx stage in frontend Dockerfile with node alpine and serve for static hosting
- Remove nginx.conf and related configuration for frontend static serving
- Update docker-compose ports and healthcheck URLs to match new port assignments
- Adjust server Dockerfile to expose new backend port 9173 and update healthcheck URL
- Create non-root user in frontend Dockerfile and run serve command on port 8847
- Update healthcheck commands to use wget on new ports for both frontend and backend

Dockerfile

@@ -1,4 +1,4 @@
-# Frontend Dockerfile (Coolify Optimized)
+# Frontend Dockerfile (Coolify Optimized - Static Server)
 FROM node:20-alpine AS builder
 
 WORKDIR /app
@@ -25,21 +25,26 @@ COPY . .
 # Build the app
 RUN npm run build
 
-# Production stage
-FROM nginx:alpine
+# Production stage - lightweight static server
+FROM node:20-alpine
 
-# Install wget for healthcheck
-RUN apk add --no-cache wget
+WORKDIR /app
+
+# Install serve for static file hosting
+RUN npm install -g serve
 
 # Copy built assets
-COPY --from=builder /app/dist /usr/share/nginx/html
+COPY --from=builder /app/dist ./dist
 
-# Copy nginx config
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+# Create non-root user
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nodejs -u 1001
+USER nodejs
 
-EXPOSE 80
+EXPOSE 8847
 
 HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD wget -q --spider http://localhost:80 || exit 1
+    CMD wget -q --spider http://localhost:8847 || exit 1
 
-CMD ["nginx", "-g", "daemon off;"]
+# Serve static files with SPA fallback
+CMD ["serve", "-s", "dist", "-l", "8847"]