Re-export streaming encoder + decoder with fixed wrapper

Three bugs found in the streaming-encoder wrapper (caught by
diffing against FluidInference's deployed conversion script
at FluidInference/parakeet-realtime-eou-120m-coreml/320ms/
convert_streaming_encoder_unified.py):
1. Now calls encoder.cache_aware_stream_step(...) instead of
the regular encoder(...) forward.
2. Trim of leading encoder frame removed — NeMo's streaming
step already returns the right valid head frames.
3. setup_streaming_params(chunk_size=8, shift_size=4) — was
defaulting to 160ms config while tracing at 320ms shapes.

Plus decoder dynamo=False fix and QUInt8 per-tensor quant.
Adds fp32 variants alongside int8.
See talat #1290.

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