feat: rename Lucy VTON public model ids

[AdirAmsalem]

Summary

• Add canonical Python SDK lucy-vton and realtime-only lucy-vton-2 model names.
• Keep lucy-2.1-vton and lucy-2.1-vton-2 as deprecated aliases.
• Update Python examples/playground/tests to use the new canonical VTON name while leaving lucy-vton-latest unchanged.

Verification

• python3 -m compileall decart/models.py examples/video_tryon.py playground/playground.py
• Importlib smoke for lucy-vton, lucy-vton-2, lucy-2.1-vton-2 alias behavior.
• Full pytest could not run locally because pytest/package deps are not installed in this worktree. CI should run the full suite.

Requested by roe in Slack (source thread).

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Note

Medium Risk
Changes public model identifiers and alias resolution for VTON models; risk is mainly compatibility/behavior changes if callers rely on old names or specific URL paths.

Overview
Adds new VTON model identifiers to the Python SDK: lucy-vton-2 (new canonical) and lucy-vton/lucy-2.1-vton-2 as deprecated/alias names in the RealTimeModels/VideoModels unions.

Updates MODEL_ALIASES and the _MODELS registry so legacy VTON names (including lucy-vton-latest and lucy-2.1-vton-2) resolve to the new canonical model IDs, while still emitting deprecation warnings for aliased names.

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