Our team keeps losing code snippets in Slack threads and personal notes. We want a single, no-frills web app that acts as a shared snippet vault—fast, clear, and distraction-free. The look should be brutally minimal: monospaced type, raw HTML feel, high-contrast text. No animations, no rounded corners.

Core features:
- Create, edit, and view snippets with syntax highlighting (use CodeMirror).
- Organize with tags and filter by them.
- Blazing-fast full-text search across titles, tags, and content, backed by PostgreSQL with pg_trgm.
- Real-time collaboration so teammates can see live presence and edits via WebSockets.
- Sign in with GitHub OAuth.

Please build it as a single-page app using Next.js and Tailwind CSS, prioritizing speed and utility over aesthetics.