delete

Summary

The production Docker build currently installs dev dependencies (mypy, ruff, black) which:

• Increases image size unnecessarily
• Adds network dependency risk during deployment (timeouts on large packages)
• Extends build time

Context

During Session 116 deployment, the build failed with a network timeout downloading mypy (5.2/12.4 MB when it timed out). While this is a transient Railway/PyPI issue, it highlighted that these dev dependencies shouldn't be in production at all.

Proposed Solution

Modify backend/Dockerfile to use multi-stage builds or separate requirements files:

• requirements.txt - Production dependencies only
• requirements-dev.txt - Dev/test dependencies (mypy, ruff, black, pytest, etc.)

The production Dockerfile should only install production dependencies.

Files Affected

• backend/Dockerfile
• backend/requirements.txt (split into prod/dev)

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