Add ARM64/Colima support and fix UI API proxying
Fix nginx.conf to proxy all API endpoints that the UI calls directly without the /api prefix. Previously, requests to /status, /branches, /clones, etc. were returning HTML instead of JSON because they were not being proxied to the DBLab server.
Add documentation for running DBLab on macOS with Apple Silicon using Colima and integrating with Supabase. Includes ARM64 image build instructions and troubleshooting for common issues.
Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com