vllm v0.25.1

# vLLM v0.25.1 ## Highlights This release features 2 commits from 2 contributors (1 new)! v0.25.1 is a patch release containing two targeted bug fixes on top of v0.25.0. ### Bug Fixes * **Avoid blocking model launching when no system FFmpeg is available for TorchCodec** (#47888). Previously raised a at import time when system FFmpeg was missing, which blocked startup (e.g. ) even when TorchCodec was not in use. The error is now deferred to runtime so it only surfaces if TorchCodec is actually needed. * **Guard mixed-dtype allreduce RMSNorm quant fusions** (#48330). The fused FlashInfer allreduce + RMSNorm + static-quantization patterns could match graphs where the activation and RMSNorm weight dtypes differ (e.g. a BF16 residual stream with an FP32 Gemma/Qwen-style RMSNorm weight in NVFP4 models), corrupting the hidden state and producing garbage output such as repeated tokens. A dtype-match guard now routes incompatible mixed-dtype graphs to the safe…