Initial frontend implementation

- React dashboard with Tailwind CSS v4
- Session-based authentication (Lucia patterns)
- API client with axios
- Project, Task, and Agent views
- Bun.serve() with HMR and API proxy
- Docker support

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

postcss.config.mjs

@@ -0,0 +1,5 @@
+export default {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  }
+}