Fix: Add unzip for bun installation

Fix: Remove volumes from railway.json (manual setup required)

Complete rewrite: Simple OpenCode Web UI with /data volume

Simplify: Use OpenCode CLI directly via npm, remove Crush

Fix: Multi-stage build with Go builder, improved binary detection

Fix: Properly install OpenCode/Crush binary in Dockerfile

Fix: Use crush command instead of opencode, add fallback install

Initial commit: OpenCode Railway deployment with Oh-My-OpenAgent