[Docs] Add Falcon H1, Hunyuan-Large, Qwen3-Omni support and update Diffusion usage (#17888)

Co-authored-by: Rishitshivam <164783543+Rishitshivam@users.noreply.github.com>
Co-authored-by: Ratish P <114130421+Ratish1@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Adarsh Shirawalmath <114558126+adarshxs@users.noreply.github.com>
Co-authored-by: zhaochenyang20 <zhaochen20@outlook.com>

docs/supported_models/index.rst

@@ -0,0 +1,14 @@
+Supported Models
+================
+
+SGLang supports a wide variety of model architectures for different use cases.
+Browse by category below to find models suited for your needs.
+
+.. toctree::
+   :maxdepth: 2
+
+   text_generation/index
+   image_generation/index
+   retrieval_ranking/index
+   specialized/index
+   extending/index