feat: add complete Docker setup for testing

- Update docker-compose.yml with frontend service and healthchecks

- Add frontend Dockerfile with dev and production stages

- Add nginx.conf for production frontend serving

- Add docker-compose.prod.yml for production deployment

- Add .env.example with all configuration options

- Add init scripts (init.sh, init.ps1) for easy setup

scripts/init.sh

@@ -0,0 +1,114 @@
+#!/bin/bash
+# =============================================================================
+# Aegis Initialization Script
+# =============================================================================
+# This script initializes the Aegis platform after starting Docker containers.
+# 
+# Usage:
+#   ./scripts/init.sh
+# =============================================================================
+
+set -e
+
+echo "╔═══════════════════════════════════════════════════════════════════════╗"
+echo "║                    Aegis - Platform Initialization                     ║"
+echo "╚═══════════════════════════════════════════════════════════════════════╝"
+echo ""
+
+# Colors for output
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+
+# Function to print status
+print_status() {
+    echo -e "${GREEN}[✓]${NC} $1"
+}
+
+print_warning() {
+    echo -e "${YELLOW}[!]${NC} $1"
+}
+
+print_error() {
+    echo -e "${RED}[✗]${NC} $1"
+}
+
+# Check if Docker is running
+if ! docker info > /dev/null 2>&1; then
+    print_error "Docker is not running. Please start Docker first."
+    exit 1
+fi
+
+# Check if containers are running
+if ! docker-compose ps | grep -q "aegis-backend"; then
+    print_warning "Containers not running. Starting them now..."
+    docker-compose up -d
+    echo ""
+    echo "Waiting for services to be healthy..."
+    sleep 10
+fi
+
+# Wait for backend to be ready
+echo "Waiting for backend to be ready..."
+MAX_RETRIES=30
+RETRY_COUNT=0
+until curl -s http://localhost:8000/health > /dev/null 2>&1; do
+    RETRY_COUNT=$((RETRY_COUNT + 1))
+    if [ $RETRY_COUNT -ge $MAX_RETRIES ]; then
+        print_error "Backend failed to start after $MAX_RETRIES attempts"
+        exit 1
+    fi
+    echo "  Waiting... ($RETRY_COUNT/$MAX_RETRIES)"
+    sleep 2
+done
+print_status "Backend is healthy"
+
+# Run database migrations
+echo ""
+echo "Running database migrations..."
+docker-compose exec -T backend alembic upgrade head
+print_status "Migrations completed"
+
+# Seed admin user
+echo ""
+echo "Seeding admin user..."
+docker-compose exec -T backend python -m app.seed 2>/dev/null || print_warning "Admin user may already exist"
+print_status "Admin user ready"
+
+# Trigger initial MITRE sync (optional)
+echo ""
+read -p "Do you want to run initial MITRE ATT&CK sync? (y/N) " -n 1 -r
+echo ""
+if [[ $REPLY =~ ^[Yy]$ ]]; then
+    echo "Triggering MITRE sync (this may take a minute)..."
+    # Get admin token
+    TOKEN=$(curl -s -X POST "http://localhost:8000/api/v1/auth/login" \
+        -d "username=admin&password=admin123" | grep -o '"access_token":"[^"]*' | cut -d'"' -f4)
+    
+    if [ -n "$TOKEN" ]; then
+        curl -s -X POST "http://localhost:8000/api/v1/system/sync-mitre" \
+            -H "Authorization: Bearer $TOKEN" > /dev/null
+        print_status "MITRE sync triggered"
+    else
+        print_warning "Could not authenticate. Run sync manually from the System page."
+    fi
+fi
+
+# Print summary
+echo ""
+echo "╔═══════════════════════════════════════════════════════════════════════╗"
+echo "║                     Aegis is ready!                                    ║"
+echo "╠═══════════════════════════════════════════════════════════════════════╣"
+echo "║                                                                        ║"
+echo "║  Frontend:       http://localhost:5173                                 ║"
+echo "║  Backend API:    http://localhost:8000                                 ║"
+echo "║  Swagger UI:     http://localhost:8000/docs                            ║"
+echo "║  MinIO Console:  http://localhost:9001                                 ║"
+echo "║                                                                        ║"
+echo "║  Default login:  admin / admin123                                      ║"
+echo "║                                                                        ║"
+echo "║  ⚠️  Change the default password in production!                        ║"
+echo "║                                                                        ║"
+echo "╚═══════════════════════════════════════════════════════════════════════╝"
+echo ""