chore(internal): remove unused Dockerfile.base and cache_heavy_deps.sh

[Swimburger]

Description

Removes two unused files from packages/generators/docker/ that are no longer referenced anywhere in the codebase.

Changes Made

• Deleted packages/generators/docker/Dockerfile.base — a legacy base image definition (Node 20.18, old fern/hey@buildwithfern.com git identity)
• Deleted packages/generators/docker/cache_heavy_deps.sh — a yarn cache-warming script only referenced by Dockerfile.base

No other file in the repository references either of these files (verified via repo-wide grep).

Testing

• Manual verification: grep -r 'Dockerfile.base\|cache_heavy_deps' . returns no results outside the deleted files themselves
• No unit tests applicable — file deletion only

Human Review Checklist

• Confirm no CI workflow, Makefile, or external build system references Dockerfile.base or cache_heavy_deps.sh (grep only covers in-repo references)
• Confirm no other Docker images use FROM fernapi/...-base or similar that could have been built from this Dockerfile

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

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✅ Devin Review: No Issues Found

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