feat: add Kimodo v1 provider boundary

[WWStoryMode]

Summary

• add a pluggable Kimodo backend and isolated CUDA inference worker behind the canonical motion API
• validate generation inputs and canonical outputs, expose model capabilities and provenance, and preserve fixture fallbacks
• add duration/progress/provenance UI, Docker Compose operating modes, tests, and implementation documentation

Verification

• service/.venv/bin/pytest — 4 passed
• inference/kimodo-worker/.venv/bin/pytest — 5 passed
• npm run build in frontend/app — passed
• git diff --cached --check — passed before commit

Scope note

The provider boundary and SOMA adapter are implemented, but real generation still needs validation on a CUDA machine against Kimodo-SOMA-RP-v1.1. The implementation log documents the remaining GPU checks and does not claim a real movement has been generated yet.