chore(python): add apt-get cleanup and best practices in python/sdk Dockerfile

[Swimburger]

Description

Applies standard Dockerfile best practices to the apt invocation in the Python v1 SDK generator image.

Changes Made

• apt → apt-get (avoid the unstable CLI warning in non-interactive contexts)
• Added --no-install-recommends to skip unnecessary suggested packages
• Added rm -rf /var/lib/apt/lists/* to clean up the apt cache and reduce final image size

Testing

• Visual inspection only — standard Dockerfile hygiene, no functional change

Human Review Checklist

• Confirm --no-install-recommends doesn't drop anything curl or git need at runtime in this image (it shouldn't, but worth a sanity check if builds break)

Link to Devin session: https://app.devin.ai/sessions/371cc6bdbad447bb9161b29b0ab8ec28
Requested by: @Swimburger

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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