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>

.dockerignore

@@ -0,0 +1,9 @@
+node_modules
+.git
+.gitignore
+*.md
+.env
+.env.local
+dist
+.cache
+*.log