Add CNN class for MNIST and integrate it into main.py and api.py (✓ Sandbox Passed)

[sweep-nightly]

Description

This pull request adds a CNN class for MNIST and integrates it into the main.py and api.py files. It also includes changes to the imports and variable names to reflect the new class.

Summary

• Added CNN class in cnn.py
• Updated imports and variable names in api.py and main.py to reflect the new class
• Updated model initialization and loading in api.py and main.py
• Updated transform definition in api.py and main.py
• Removed unnecessary code in main.py

Fixes #9.

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[sweep-nightly]

Sandbox Executions

• Ran sandbox for src/cnn.py. ✓

Sandbox logs for

trunk fmt src/cnn.py || exit 0 1/2 ✓

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

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

Checked 1 file
✔ No issues

• Ran sandbox for src/main.py. ✓

Sandbox logs for https://github.com/sweepai/evals/commit/bae28160bd90cc0881e378dcb3f66de774238ff6

trunk fmt src/main.py || exit 0 1/2 ✓

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


Checked 1 file
✔ No issues

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

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

• Ran sandbox for src/api.py. ✓

Sandbox logs for https://github.com/sweepai/evals/commit/2115f6673fc3625e219f65d53e857a48ba5fdd01

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]

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