Revert "feat(sdk): add lucy-vton-3.5 realtime and batch models (#188)"

[AdirAmsalem]

Reverts #188.

lucy-vton-3.5 is being rolled back from the JS SDK. This cleanly reverts the merged squash commit that added the CanonicalModel name(s), Zod schema, .realtime/.video` registry entries, ModelSpecificInputs wiring, and unit/e2e tests.

Note: the published @decartai/sdk release (v0.1.15) still ships the id; this revert only returns source main to its pre-3.5 state.

---

Note

Medium Risk
Breaking change for code calling models.realtime/video("lucy-vton-3.5") against builds from main; scope is limited to model IDs and tests with no auth or data-path changes.

Overview
Rolls back lucy-vton-3.5 from the JS SDK after the prior add-3.5 change, so main no longer exposes that id for realtime or queue/video APIs.

Registry & types: The model is dropped from canonical name lists, Zod realtime/video unions, modelInputSchemas, and the internal realtime/video _models maps (including generate/job URL paths). ModelSpecificInputs no longer treats lucy-vton-3.5 as VideoEdit2Inputs. Comments and AGENTS.md now document lucy-vton-latest → lucy-vton-3 (not 3.5).

Surface area: The SDK demo index.html model picker no longer lists Lucy VTON 3.5. Unit tests drop 3.5 coverage and expect listModels() to return 25 entries (was 27); e2e realtime and queue tests for lucy-vton-3.5 are removed.

Note: A published release may still ship 3.5 until a new publish; this revert only affects source on main.

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