feat(web): obtainium download links page

[NicholasFlamy]

Description

This adds a page, linked from the Utilities page, that contains direct download links to the GitHub release assets for the version matching the server's version. This is very beneficial for users who make use of tools like Obtainium because they can match server and app versions and retain stability.

Implements #15779

How Has This Been Tested?

• make dev instance to confirm UI changes etc.
• Built a release version to test with Obtainium
  • dev instances with hot reload use client-side JS, which Obtainium doesn't run

Screenshots (if appropriate)

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)

[NicholasFlamy]

Too many issues that would require #17758 or similar.