Closes #
## Description
Standardising this across all modules:
- remove default node & nvm installation
<!-- Briefly describe what this PR does and why -->
## Type of Change
- [ ] New module
- [ ] Bug fix
- [x] Feature/enhancement
- [ ] Documentation
- [ ] Other
## Module Information
<!-- Delete this section if not applicable -->
**Path:** `registry/coder-labs/modules/gemini`
**New version:** `v2.0.0`
**Breaking change:** [x] Yes [ ] No
## Testing & Validation
- [x] Tests pass (`bun test`)
- [x] Code formatted (`bun run fmt`)
- [ ] Changes tested locally
## Related Issues
<!-- Link related issues or write "None" if not applicable -->
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Co-authored-by: DevCats <christofer@coder.com>
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