perf: share one Silero ONNX session across VAD analyzers - #5666
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Every SileroVADAnalyzer built its own InferenceSession, so memory grew with concurrent pipelines. Sessions are read-only and thread-safe, so cache one per model file. Per-analyzer VAD state is untouched. Fixes pipecat-ai#2050
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Fixes #2050. One shared ONNX session per model file across
SileroVADAnalyzerinstances; per-analyzer state untouched.