Fix start.sh bash variable interpolation

Remove proxyKey config override workaround in start.sh

Simplify proxyKey override directly to opencode-router.json

Fix first-boot initialization order for proxyKey

Only update proxyKey in opencode-router.json preserving all original config

Simplify start.sh to native opencode-router behavior

Pre-populate models cache and complete fallback config

Clean Dockerfile and modernize environment settings

Use opencode-router.json for proxyKey configuration

Initial clean n8n space setup