docs: Link HSTU AOTI example from PyTorch backend README (#201)

[yinggeh]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a new ### HSTU (Generative Recommenders) documentation section to the README, describing the HSTU sequence encoder and linking out to the tutorials and recsys-examples inference guides.

• Adds a concise description of HSTU and its use of the torch_aoti platform, then cross-links the triton-inference-server tutorials and NVIDIA recsys-examples repos for end-to-end guidance.
• The new section is inserted between the MODEL_INIT_LIBRARY and ### PyTorch 2.0 Models sections with no structural or code changes.

Confidence Score: 5/5

Documentation-only change; no code, configuration, or logic is modified.

The change is a 13-line addition to the README that introduces a description of HSTU and two cross-reference links. Nothing executable is touched, and the new text is accurate and well-placed relative to the surrounding torch_aoti-related content.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a new HSTU (Generative Recommenders) section with a description and two external links; no code changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    User([User])
    README["README.md — HSTU section"]
    Tutorial["triton-inference-server/tutorials\nPopular_Models_Guide/HSTU"]
    RecSys["NVIDIA/recsys-examples\nexamples/hstu/inference/README.md"]
    Backend["PyTorch Backend\nplatform: torch_aoti"]

    User --> README
    README -->|"HSTU tutorial link"| Tutorial
    README -->|"recsys-examples link"| RecSys
    Tutorial --> Backend
    RecSys --> Backend

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