fix: handle digit-bearing model architectures in M3L Signed-off-by: nitbig <nitishkr13245@gmail.com>

[nitbig]

What this PR does / why we need it:

This PR improves model architecture extraction in the M3L ReID model loader.

The previous regular expression only supported architecture names containing alphabetic characters, which caused supported models such as resnet50 and resnet101 to fail during model loading.

The updated expression supports architecture names containing letters, numbers, underscores and hyphens. It also explicitly supports both .pth and .pth.tar checkpoint formats.

The model loader now raises a clear ValueError when the architecture cannot be inferred from the checkpoint filename instead of failing with an unclear AttributeError.

The existing addmm_ update is also retained to use the current PyTorch keyword based API.

Testing:

Verified architecture extraction for IBNMeta, resnet50 and other digit based architecture names.

Verified support for .pth and .pth.tar checkpoint filenames.

Verified that invalid checkpoint filenames produce a clear ValueError.

Which issue(s) this PR fixes:

Fixes #445

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