Collapse Dockerfile to 2 stages with Python 3.13-alpine

[nitrobass24]

Summary

• Merge python-deps and runtime stages into a single python:3.13-alpine stage (3 stages → 2)
• Eliminates redundant alpine:3.21 base and COPY --from=python-deps /usr/local/ /usr/local/ step
• Upgrade Python 3.12 → 3.13 (active bugfix support)
• Remove 6 dead stdlib cleanup entries for modules removed from CPython (distutils, lib2to3, audioop, ossaudiodev, nis, _crypt)
• Replace pip uninstall -y pip setuptools with direct rm -rf (more reliable)
• Update CI python-version from "3.12" to "3.13" across python-lint, python-typecheck, and python-test jobs

Test plan

• CI passes — all jobs (lint, typecheck, unit tests, Docker build + E2E)
• make build builds successfully
• make run — container serves on port 8800
• make size — image size same or smaller

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8175f16f-b6c4-4d92-a56e-78d320630b03

📥 Commits

Reviewing files that changed from the base of the PR and between 1007581 and c0e4332.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• src/docker/build/docker-image/Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/dockerfile-python313-alpine

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