PaintPlus's backend already supported invokeai/comfyui providers (generic
"self-hosted, on another machine" remote APIs) but the installer never
exposed them and the compose file never passed the URLs through. Add a
3rd provider choice — shown only when the ai-stack service is installed —
that sets AI_PROVIDER + INVOKEAI_URL/COMFYUI_URL and joins ai-stack's
Docker network (ai-stack_default) so PaintPlus can reach those containers
by name. No cloud key, no extra GPU download: it rides on ai-stack's
already-running InvokeAI/ComfyUI.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nb2vJ8W7bHKx1JXVvpCraH
Claude
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