fix: Resolve Docker build failures for frontend and backend

Backend fix:
- Add python3-dev to build dependencies for psutil compilation
- psutil requires Python development headers to build C extensions

Frontend fix:
- Explicitly copy package-lock.json to ensure it's available for npm ci
- Add verification step to confirm package-lock.json exists before npm ci
- Prevents "npm ci" usage errors due to missing lock file

backend/Dockerfile

@@ -3,9 +3,10 @@ FROM python:3.11-slim as builder
 
 WORKDIR /app
 
-# Install system dependencies
+# Install system dependencies for building Python packages
 RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \
+    python3-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements and install dependencies

frontend/Dockerfile

@@ -4,10 +4,10 @@ FROM node:20-alpine AS builder
 WORKDIR /app
 
 # Copy package files
-COPY package*.json ./
+COPY package.json package-lock.json ./
 
-# Install dependencies
-RUN npm ci
+# Verify package-lock.json exists and install dependencies
+RUN test -f package-lock.json && npm ci
 
 # Copy source code
 COPY . .