Initial commit: Backend with Bun.serve() + Drizzle ORM

- Bun 1.3.6 server setup
- MariaDB schema (projects, agents, tasks)
- Auto-migrations on startup
- WebSocket support
- Health check endpoint

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

index.ts

@@ -0,0 +1 @@
+console.log("Hello via Bun!");