feat(models): add lucy-vton-3.5.2

[AdirAmsalem]

Human TL;DR

TODO(requester): Fill this in with the human-facing summary before marking the PR ready for review.

Summary

• Add lucy-vton-3.5.2 as a canonical realtime and queue/video model in the Python SDK registry.
• Reuse the existing VTON video-edit input schema and 1280x720 model dimensions.
• Add model lookup coverage for realtime and queue/video surfaces.

Checks

• .venv/bin/python -m pytest tests/test_models.py
• .venv/bin/python -m ruff check decart/models.py tests/test_models.py

Notes

• Independent Claude Code review could not run because local Claude OAuth is revoked. Codex review also could not inspect the diff due a local bubblewrap sandbox error.

Requested by Peleg in Slack (#C0B4F8N3H7W) - message link