Fix missing 2π factor in seconds_freqs across all dit.onnx (FP32 source ONNX)

The base FP32 dit.onnx files were exported by an older version of the
producer (fast_load/build_dit.py) before the 2π fix was applied. The
post-surgery dit_fp16mixed.onnx files DID get the fix re-injected (their
seconds_freqs has max ≈ 62832 = 2π × 10000), but the source dit.onnx
files were never re-uploaded and still have max=10000.

Effect: any consumer building from dit.onnx (e.g., `--precision fp32`
path that reads sa3-m/dit.onnx, or anyone re-running build_dit_fp16mixed
locally) would inherit the silence-after-~5s bug — the seconds_total
conditioner produces frequencies 2π× too low, so the Fourier features
collapse and the model can't condition on duration beyond ~5s.

Surgical fix: read the (128,) seconds_freqs initializer in each dit.onnx,
multiply by 2π, write back. For sa3-m the buffer is in the .data sidecar
at offset 3072+512 bytes — read it from there, multiply, and inline the
result into the .onnx so the 5.8 GB .data file doesn't need to be
re-uploaded. For sa3-sm-music/sfx the buffer was already inline.

Reference build_dit.py:172 — `freqs = freqs * (2.0 * math.pi)`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

onnx/sa3-m/dit.onnx

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onnx/sa3-sm-music/dit.onnx

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onnx/sa3-sm-sfx/dit.onnx

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