[Blog] Model inference with Prefill-Decode disaggregation

[peterschmidt85]

Note

Low Risk
Adds a new documentation/blog post only; no product code or configuration defaults change.

Overview
Adds a new blog post (docs/blog/posts/pd-disaggregation.md) announcing native Prefill–Decode (PD) disaggregation support for SGLang-backed inference in dstack.

The post includes example service and gateway YAML showing separate prefill/decode replica groups and enabling router.pd_disaggregation, plus notes on current limitations and planned follow-ups.

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