Restore original known-good arcface_w600k_r50.fp16.mnn (revert 06-28 emap reconversion)

Aura Swap: reconvert arcface_w600k_r50.fp16.mnn (emap baked into inswapper; parity-verified vs onnxruntime)

Restore working face-swap models (scrfd_10g, arcface_w600k_r50, inswapper_128, codeformer)

Remove non-commercial face-swap models (replaced by commercial-licensed set)

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