refactor: convert repository to monorepo with npm workspaces

Restructured the repository into a monorepo to better organize application code
and maintenance scripts.

## Workspace Structure
- web-app: Next.js application (all app code moved from root)
- housekeeping: Database backup and maintenance scripts

## Key Changes
- Moved all application code to web-app/ using git mv
- Moved database scripts to housekeeping/ workspace
- Updated Dockerfile for monorepo build process
- Updated docker-compose files (volume paths: ./web-app/etc/hosts/)
- Updated .gitignore for workspace-level node_modules
- Updated documentation (README.md, CLAUDE.md, CHANGELOG.md)

## Migration Impact
- Root package.json now manages workspaces
- Build commands delegate to web-app workspace
- All file history preserved via git mv
- Docker build process updated for workspace structure

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

web-app/app/ui/Pdf417Barcode.tsx

@@ -0,0 +1,34 @@
+'use client';
+
+import { useState, useEffect, FC } from 'react';
+import { generateBarcode } from '../lib/pdf/pdf417';
+import { renderBarcode } from '../lib/pdf/renderBarcode';
+
+export const Pdf417Barcode:FC<{hub3aText:string, className?: string }> = ({  hub3aText: hub3a_text, className }) => {
+    const [bitmapData, setBitmapData] = useState<string | undefined>(undefined);
+
+    console.log("Rendering Pdf417Barcode with hub3a_text:", hub3a_text);
+
+    useEffect(() => {
+        const aspectRatio = 3;
+        const errorCorrectionLevel = 4; // error correction 4 is common for HUB3A PDF417 barcodes
+        
+        const barcodeMatrix = generateBarcode(hub3a_text, errorCorrectionLevel ?? 4 , aspectRatio);
+        const bitmap = renderBarcode(barcodeMatrix, 4, 3); // 4:3 block size is common for HUB3A PDF417 barcodes
+        setBitmapData(bitmap);
+    }, [hub3a_text]);
+
+    // Don't render until bitmap is generated (prevents hydration mismatch)
+    if (!bitmapData) {
+        return (
+            <div style={{ width: "350px", height: "92px" }} className="flex items-center justify-center">
+                <span className="loading loading-spinner loading-lg"></span>
+            </div>
+        );
+    }
+
+    return (
+        // eslint-disable-next-line @next/next/no-img-element
+        <img src={bitmapData} alt="PDF417 Barcode" className={className}  />
+    );
+}