fix(server): add embedding table repair (#14895)

fix #14894


#### PR Dependency Tree


* **PR #14895** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Improved database initialization for self-hosted deployments with
automatic creation and repair of embedding tables and indexes, applied
only when related base tables and extensions are present.
* Updated pre-deploy process to run Prisma migrations, perform
embedding-table maintenance, and execute additional data migrations as
part of setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->