Reorganize project structure: move docs and scripts to proper directories

Changes:
- Created scripts/ directory for build and utility scripts
- Moved build-for-airgap.sh to scripts/
- Moved check-ready.sh to scripts/
- Kept quickstart scripts in root for easy access
- Moved HELM-DEPLOYMENT.md to docs/

Updated references:
- README.md: Updated link to docs/HELM-DEPLOYMENT.md
- docs/DEPLOYMENT.md: Updated paths to scripts/build-for-airgap.sh
- quickstart-airgap.sh: Updated path to scripts/build-for-airgap.sh
- scripts/check-ready.sh: Updated self-reference path
- helm/warehouse13/QUICKSTART.md: Updated HELM-DEPLOYMENT.md path
- helm/README.md: Updated HELM-DEPLOYMENT.md path

Directory structure now:
/
├── README.md (root)
├── quickstart.sh (root - easy access)
├── quickstart-airgap.sh (root - easy access)
├── docs/ (all documentation)
│   ├── API.md
│   ├── ARCHITECTURE.md
│   ├── DEPLOYMENT.md
│   ├── FEATURES.md
│   ├── FRONTEND_SETUP.md
│   ├── HELM-DEPLOYMENT.md (moved here)
│   └── SUMMARY.md
├── scripts/ (build and utility scripts)
│   ├── build-for-airgap.sh (moved here)
│   └── check-ready.sh (moved here)
└── helm/
    └── warehouse13/ (Helm chart with docs)

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

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

scripts/check-ready.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+echo "========================================="
+echo "Warehouse13 - Readiness Check"
+echo "========================================="
+echo ""
+
+errors=0
+
+# Check if pre-built files exist
+if [ -d "frontend/dist/frontend/browser" ]; then
+    echo "✓ Pre-built Angular files found"
+    echo "  Location: frontend/dist/frontend/browser"
+    file_count=$(ls -1 frontend/dist/frontend/browser | wc -l)
+    echo "  Files: $file_count"
+else
+    echo "✗ ERROR: Pre-built Angular files NOT found!"
+    echo "  Expected: frontend/dist/frontend/browser"
+    echo ""
+    echo "  You need to build the Angular app first:"
+    echo "  Run: ./scripts/build-for-airgap.sh"
+    echo "  OR:  cd frontend && npm install && npm run build:prod"
+    echo ""
+    errors=$((errors + 1))
+fi
+
+echo ""
+
+# Check if docker-compose.yml is configured for pre-built
+if grep -q "Dockerfile.frontend.prebuilt" docker-compose.yml; then
+    echo "✓ docker-compose.yml configured for pre-built deployment"
+else
+    echo "⚠ WARNING: docker-compose.yml may not be configured for pre-built deployment"
+    echo "  Current frontend dockerfile:"
+    grep "dockerfile:" docker-compose.yml | grep -A 1 "frontend:" | tail -1
+    echo ""
+    echo "  For air-gapped deployment, it should be: Dockerfile.frontend.prebuilt"
+fi
+
+echo ""
+
+# Check if Docker is running
+if docker info &> /dev/null; then
+    echo "✓ Docker is running"
+else
+    echo "✗ ERROR: Docker is not running or not accessible"
+    errors=$((errors + 1))
+fi
+
+echo ""
+echo "========================================="
+
+if [ $errors -eq 0 ]; then
+    echo "✓ Ready to deploy!"
+    echo ""
+    echo "Run: docker-compose up -d --build"
+    echo "Or:  ./quickstart-airgap.sh"
+    exit 0
+else
+    echo "✗ NOT ready - please fix the errors above"
+    exit 1
+fi