fix: Fix production Dockerfile for ES modules

🔧 Production Docker Fix

## Issue Fixed:
- Production container failing with 'Cannot find module /app/dist/main.js'
- ES modules not properly handled in production build

## Solution:
- Simplified Dockerfile.prod to single-stage build
- Install all dependencies for build, then prune dev dependencies
- Direct ES module execution: 'node dist/main.js'
- Proper file copying and permissions

## Key Changes:
- Removed complex multi-stage build
- Added npm prune --production after build
- Direct node execution instead of npm script
- Maintained all necessary system dependencies

This fixes the production deployment issue where the NestJS
application wasn't starting due to ES module configuration.

Author: gnowgi

nodebook-base/Dockerfile.prod

@@ -1,8 +1,5 @@
 # NodeBook NestJS Production Dockerfile
-# Multi-stage build for optimized production image
-
-# Stage 1: Base image with Node.js 20 LTS
-FROM node:20-alpine AS base
+FROM node:20-alpine
 
 # Install system dependencies for libp2p and crypto
 RUN apk add --no-cache \
@@ -18,13 +15,7 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
-RUN npm ci --only=production && npm cache clean --force
-
-# Stage 2: Development dependencies
-FROM base AS development
-
-# Install development dependencies
+# Install all dependencies (including dev dependencies for build)
 RUN npm ci
 
 # Copy source code
@@ -33,24 +24,8 @@ COPY . .
 # Build NestJS application
 RUN npm run build
 
-# Create necessary directories with proper permissions
-RUN mkdir -p user_data logs media data && \
-    chmod -R 755 user_data logs media data
-
-# Expose port
-EXPOSE 3000
-
-# Health check
-HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
-    CMD node -e "require('http').get('http://localhost:3000/api/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) })"
-
-# Start NestJS application
-CMD ["npm", "run", "start"]
-
-# Stage 3: Production build
-FROM development AS production
-
-# No additional steps needed - build was done in development stage
+# Remove dev dependencies to reduce image size
+RUN npm prune --production
 
 # Create necessary directories with proper permissions
 RUN mkdir -p user_data logs media data && \
@@ -63,5 +38,5 @@ EXPOSE 3000
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD node -e "require('http').get('http://localhost:3000/api/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) })"
 
-# Start NestJS application
-CMD ["npm", "run", "start"]
+# Start NestJS application (ES modules)
+CMD ["node", "dist/main.js"]