docs: add image-to-video support for vLLM-Omni in diffusion support matrix (#7374)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rmccorm4

docs/features/diffusion/README.md

@@ -16,13 +16,10 @@ Dynamo supports serving diffusion models across multiple backends, enabling gene
 | Text-to-Text | ✅ | ✅ | ❌ |
 | Text-to-Image | ✅ | ✅ | ❌ |
 | Text-to-Video | ✅ | ✅ | ✅ |
-| Image-to-Video | ❌ | ❌ | ❌ |
+| Image-to-Video | ✅ | ❌ | ❌ |
 
 **Status:** ✅ Supported | ❌ Not supported
 
-> [!NOTE]
-> Image-to-video support is planned and coming soon across all backends.
-
 ## Backend Documentation
 
 For deployment guides, configuration, and examples for each backend: