Downgrade to Angular 17 with webpack for better restricted environment compatibility

- Downgrade from Angular 19 to Angular 17.3.0
- Switch from Vite-based build (@angular/build) to webpack (@angular-devkit/build-angular)
- Eliminates Vite, esbuild, and rollup dependencies that were causing issues in restricted npm environments
- Update tsconfig.json for webpack compatibility (moduleResolution: bundler)
- Update angular.json to use browser builder instead of application builder
- Update docker-compose.yml to use prebuilt Dockerfile for air-gapped deployment
- Add build-for-airgap.sh helper script for local builds
- Update DEPLOYMENT.md with Angular 17 webpack strategy notes
- Bundle size: 329.73 kB raw / 86.54 kB gzipped

This change improves compatibility with enterprise environments that have restricted package registry access.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

build-for-airgap.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+set -e
+
+echo "========================================="
+echo "Building Angular for Air-Gapped Deployment"
+echo "========================================="
+echo ""
+
+# Check if we're in the right directory
+if [ ! -f "docker-compose.yml" ]; then
+    echo "Error: Must run from project root directory"
+    exit 1
+fi
+
+# Check if node is installed
+if ! command -v node &> /dev/null; then
+    echo "Error: Node.js is not installed. Please install Node.js 18+ first."
+    exit 1
+fi
+
+# Check if npm is installed
+if ! command -v npm &> /dev/null; then
+    echo "Error: npm is not installed. Please install npm first."
+    exit 1
+fi
+
+echo "Step 1/3: Installing dependencies..."
+cd frontend
+npm install
+
+echo ""
+echo "Step 2/3: Building Angular production bundle..."
+npm run build:prod
+
+echo ""
+echo "Step 3/3: Verifying build output..."
+if [ -d "dist/frontend/browser" ]; then
+    echo "✓ Build successful!"
+    echo "✓ Output: frontend/dist/frontend/browser"
+    ls -lh dist/frontend/browser | head -5
+else
+    echo "✗ Build failed - output directory not found"
+    exit 1
+fi
+
+cd ..
+
+echo ""
+echo "========================================="
+echo "Build Complete!"
+echo "========================================="
+echo ""
+echo "Next steps:"
+echo "1. Update docker-compose.yml:"
+echo "   Change: dockerfile: Dockerfile.frontend"
+echo "   To:     dockerfile: Dockerfile.frontend.prebuilt"
+echo ""
+echo "2. Deploy:"
+echo "   docker-compose up -d --build"
+echo ""
+echo "See DEPLOYMENT.md for more details."
+echo "========================================="