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三芯片合并:AX620E/AX637 升级 encoder+decoder 全 NPU,新增新一代 SDK;AX650 保持老 SDK
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remove old partial (encoder-NPU/decoder-CPU) ax620e/ax637 models
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feat: add AX620E and AX637 support (encoder NPU + decoder ONNX fallback)
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- AX620E: Encoder axmodel (U16, cosine 1.0), Decoder ONNX (CPU)
- AX637: Encoder axmodel (U16, cosine 1.0), Decoder ONNX (CPU)
- AX650: Full NPU (encoder + decoder axmodel)
- Multi-chip engine with auto-detection
- Note: HiFi-GAN decoder cannot compile on AX620E/AX637
(ConvTranspose stride=8 exceeds NPU tiling limits)