<!-- Add the related story/sub-task/bug number, like Resolves#123, or
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**Related issue:** Resolves#37244
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## Testing
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Internal MySQL utility package reorganized and all internal imports
updated to the new platform location; no changes to end-user
functionality or behavior.
* **Documentation**
* Added platform package documentation describing infrastructure
responsibilities and architectural boundaries to guide maintainers.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
