Add CNN Model for MNIST Classification (✓ Sandbox Passed)

[sweep-nightly[bot]]

Description

This pull request adds a Convolutional Neural Network (CNN) model for MNIST classification. It also updates the import statements and file references accordingly.

Summary

• Updated import statements and file references in src/api.py and src/main.py.
• Added src/cnn.py which contains the CNN model for MNIST classification.
• Updated the model instantiation in src/api.py and src/main.py to use the new CNN model.
• Updated the transform used for preprocessing the image in src/api.py.
• Added a new predict endpoint in src/api.py to handle image classification using the CNN model.
• Updated the model training process in src/main.py to use the new CNN model.
• Removed the Net class from src/main.py as it is no longer used.
• Saved the trained CNN model to mnist_model.pth.

Fixes #9.

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Sandbox Executions

• [X] Ran sandbox for src/cnn.py. ✓

  Sandbox logs for

trunk fmt src/cnn.py || exit 0 1/2 ✓

Checked 1 file
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trunk check --fix --filter=-ruff --print-failures src/cnn.py 2/2 ✓

Checked 1 file
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• [X] Ran sandbox for src/main.py. ✓

  Sandbox logs for https://github.com/sweepai/evals/commit/ac124aa1a1b593648bb31cd144f27267be735a4d

trunk fmt src/main.py || exit 0 1/2 ✓

 ✔ Formatted src/main.py
Re-checking autofixed files...

 ✔ Formatted src/main.py
Re-checking autofixed files...

Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --filter=-ruff --print-failures src/main.py 2/2 ✓

Checked 1 file
✔ No issues

• [X] Ran sandbox for src/api.py. ✓

  Sandbox logs for https://github.com/sweepai/evals/commit/b4aaeeebfbbe7fdc5bd45c0b8693c03cdf501f9a

trunk fmt src/api.py || exit 0 1/2 ✓

 ✔ Formatted src/api.py
Re-checking autofixed files...

 ✔ Formatted src/api.py
Re-checking autofixed files...

Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --filter=-ruff --print-failures src/api.py 2/2 ✓

Checked 1 file
✔ No issues

[sweep-nightly[bot]]

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