REFACTOR(repo): simplify project structure

- Move services/nextjs/ to nextjs/
- Move Dockerfile.prod to Dockerfile at root
- Remove deploy/ folder (K8s manifests moved to K3S-HOME/web-apps)
- Remove .gitea/ workflows
- Update GitHub Actions for new structure
- Remove develop branch triggers

nextjs/next.config.ts

@@ -0,0 +1,10 @@
+import type { NextConfig } from "next";
+import createNextIntlPlugin from 'next-intl/plugin';
+
+const withNextIntl = createNextIntlPlugin('./i18n/request.ts');
+
+const nextConfig: NextConfig = {
+  output: 'standalone',
+};
+
+export default withNextIntl(nextConfig);