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/[locale]/home/page.tsx

@@ -0,0 +1,31 @@
+import { FC, Suspense } from 'react';
+import { Main } from '@/app/ui/Main';
+import HomePage from '@/app/ui/HomePage';
+import { MonthCardSkeleton } from '@/app/ui/MonthCardSkeleton';
+
+export interface PageProps {
+  searchParams?: {
+    year?: string;
+    month?: string;
+  };
+}
+
+const HomePageSkeleton = () => 
+<>
+  <MonthCardSkeleton checked={true} />
+  <MonthCardSkeleton />
+  <MonthCardSkeleton />
+</>
+
+const Page:FC<PageProps> = async ({ searchParams }) => {
+
+ return (
+    <Main>
+      <Suspense fallback={<HomePageSkeleton />}>
+        <HomePage searchParams={searchParams} />
+      </Suspense>
+    </Main>
+  );
+}
+
+export default Page;