REFACTOR(docker): remove unused public folder copy

- Remove unnecessary COPY command
- Clean up Dockerfile

deploy/docker/Dockerfile.prod

@@ -33,9 +33,6 @@ ENV NEXT_TELEMETRY_DISABLED=1
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs
 
-# Copy built application
-COPY --from=builder /app/public ./public
-
 # Set the correct permission for prerender cache
 RUN mkdir .next
 RUN chown nextjs:nodejs .next