fix(config): declare offline-mode keys in env schema and example

[patil2001]

Summary

The Linux devtools route pointed OpenCode's local endpoint at ${OLLAMA_PORT:-8080}, but llama-server — the thing actually listening in this stack — defaults to 11434 via its own compose mapping. On hosts without an OLLAMA_PORT override, coding-agent requests went to a port nothing serves. The default now matches the compose llama-server host port.

AI Assistance

AI-assisted cross-check of port defaults between installer and compose. The author reviewed the routing branch and is responsible for the final diff.

Release Lane

• Stable hotfix targeting release/2.6.x
• Mainline change targeting main
• Next-minor work targeting the next feature/minor release
• Not sure; reviewer should help classify

Stable hotfix reason:

Not targeting the stable release branch directly.

Changed Surface

• Docs only
• Tests only
• Dashboard UI
• Installer
• Core runtime
• Dashboard API
• CI workflows

Validation

• bash -n ods/installers/phases/07-devtools.sh - passed.