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/SignInButton.tsx

@@ -0,0 +1,30 @@
+"use client";
+
+import { signIn } from "next-auth/react"
+import { useTranslations } from "next-intl";
+import Image from "next/image";
+
+const providerLogo = (provider: {id:string, name:string}) => {
+    switch(provider.id) {
+        case "google": return "https://authjs.dev/img/providers/google.svg";
+        case "facebook": return "https://authjs.dev/img/providers/facebook.svg";
+        case "github": return "https://authjs.dev/img/providers/github.svg";
+        case "twitter": return "https://authjs.dev/img/providers/twitter.svg";
+        case "email": return "https://authjs.dev/img/providers/email.svg";
+        case "linkedin": return "https://authjs.dev/img/providers/linkedin.svg";
+        default: return "https://authjs.dev/img/providers/google.svg";
+    }
+}
+
+export const SignInButton:React.FC<{ provider: {id:string, name:string} }> = ({ provider }) => {
+
+  const t = useTranslations("login-page");
+
+    return(
+        <button className="btn btn-neutral m-1" onClick={() => signIn(provider.id, { callbackUrl:"/home" }) } data-umami-event="user-login">
+            <Image alt="Provider Logo" loading="lazy" height="24" width="24" id="provider-logo-dark" src={providerLogo(provider)} />
+            <span>
+                {t("sign-in-button")} {provider.name}</span>
+        </button>
+    );
+}