chore: remove deprecated files and configurations

- Deleted .gitignore, biome.json, next.config.ts, package.json, pnpm-lock.yaml, pnpm-workspace.yaml, postcss.config.mjs, README.md, and various API, component, and utility files to clean up the codebase.
- Removed unused database files and migration scripts to streamline the project structure.
- Eliminated obsolete hooks and services to enhance maintainability and reduce clutter.

public/vercel.svg

@@ -1 +0,0 @@
-<svg fill="none" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1155 1000"><path d="m577.3 0 577.4 1000H0z" fill="#fff"/></svg>