feat: remove retired lucy-vton-2 and lucy-vton-3 model IDs

[tomershlasky]

Summary

• Remove RealtimeModels.LUCY_VTON_2 / LUCY_VTON_3, VideoModels.LUCY_VTON_2 / LUCY_VTON_3 and the deprecated LUCY_2_1_VTON_2 constants, their fromName branches and their entries in all / allIncludingDeprecated.
• LUCY_VTON_3_5 and LUCY_VTON_LATEST are unchanged. README tables and the VideoEditInput list updated.
• Tests: counts drop to 7 realtime / 9 video models; the vton-2/3 and alias assertions are removed and the first video test asserts LUCY_2_1 instead.

Same shape as #6 (retired Lucy 2 IDs). Mirrors DecartAI/sdk#205. Public constants are removed, so this warrants a minor bump (0.8.0) rather than a patch.

Test plan

• ./gradlew :sdk:testDebugUnitTest --tests 'ai.decart.sdk.RealtimeModelsTest' --tests 'ai.decart.sdk.VideoModelsTest' (JDK 17): 11 + 3 tests, 0 failures

https://claude.ai/code/session_01TNMMxPdhY2U2YZpnbKxZEN

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Note

Medium Risk
Removing public model constants is a breaking change for apps still referencing vton-2/3; behavior is limited to registry/docs/tests with no runtime logic changes.

Overview
Retires lucy-vton-2 and lucy-vton-3 from the Android SDK model registries, matching the JS SDK and prior Lucy 2 ID removals.

Public constants LUCY_VTON_2 / LUCY_VTON_3 are dropped from RealtimeModels and VideoModels, along with the deprecated LUCY_2_1_VTON_2 alias and all related fromName branches and all / allIncludingDeprecated entries. LUCY_VTON_3_5 and LUCY_VTON_LATEST stay; batch LUCY_VTON_3_5 docs now state 1280×720 output.

README model tables and the VideoEditInput supported-model list no longer mention vton-2/3. Unit tests expect 7 realtime and 9 video models and drop vton-2/3 coverage.

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