FEP(sig-framework): vLLM-Plugin-FL features for FlagOS 2.2

[wbavon]

Provisional FEP for the vllm-plugin-FL work planned for the FlagOS 2.2 cycle:

1. 10-vendor adaptation on vLLM 0.20.2 + 5-vendor upgrade to vLLM 0.24.0 (Empty mode).
2. Empty-build support — device-less vLLM build with the plugin supplying the hardware layer.
3. Operator-granularity auto-tuning — per-platform selection of the best operator implementation.

Owner and the marked TODOs (per-vendor acceptance bar, the 5 committed 0.24.0 vendors, auto-tuning design) to be filled before Implementable (FEP Freeze 2026-08-14).

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ wbavon
❌ yunbowang328
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