chore: add Docker deployment files, README, and Prisma migrations

- Add Dockerfile and docker-compose.yml for VPS/LXC deployment.
- Update README with setup, environment variables, and deployment notes.
- Commit initial Prisma migration for SQLite schema.
- Configure Next.js for standalone output and dev origin allowlist.

next.config.ts

@@ -1,7 +1,8 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  output: 'standalone',
+  allowedDevOrigins: ['192.168.2.197'],
 };
 
 export default nextConfig;