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/next.config.js

@@ -0,0 +1,25 @@
+const createNextIntlPlugin = require('next-intl/plugin');
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+    // Possible options:
+    // - `undefined`: The default build output, `.next` directory, that works with production mode `next start` or a hosting provider like Vercel
+    // - `'standalone'`: A standalone build output, `.next/standalone` directory, that only includes necessary files/dependencies. Useful for self-hosting in a Docker container.
+    // - `'export'`: An exported build output, `out` directory, that only includes static HTML/CSS/JS. Useful for self-hosting without a Node.js server.
+    output: "standalone", // needed for running the app in a Docker container
+    experimental: {
+       // "x-forwarded-host" is a HTTP header added by a reverse proxy,
+       // and it contains the original host requested by the client
+       // this is needed for the server to know which host to render
+       // This however differs from the "Host" header, which results in
+       // server rejecting API requests from the client
+       // So here we tell Next.JS to accept requests  where the "x-forwarded-host" equals and of the following values
+       serverActions: { allowedOrigins: ["rezije.app", "rezije.app:80", "localhost:3001", "0.0.0.0:80"], }
+   }
+};
+
+const withNextIntl = createNextIntlPlugin('./app/i18n.ts');
+ 
+const nextConfigIntl = withNextIntl(nextConfig);
+
+module.exports = nextConfigIntl;