feat: add option to exclude artists/albums from global top lists

[hgcummings]

Description

Allows excluding albums (or artists) from global "Top [entity]" lists and summaries, for example so seasonal artists/albums don't skew retrospectives.

Related Issue(s)

As discussed in #320

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Unit Tests
• Manual Testing (please describe steps)

Have tested excluding albums and artists, then viewing global top artist/track/album pages and "rewind" pages.

Checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have ensured my changes generate no new warnings

AI/LLM Usage

• I disclose that ~50% of the code in this PR is written by an LLM, specifically:
• ~90% of the CRUD for the new properties (which I've reviewed, and tweaked the UI)
• ~50% of the tests (LLM wrote the first draft, which I've reviewed and rewritten)
• ~0% of the query logic (written by me, with some review by an LLM)
• I fully understand all changes made by LLM-generated code.
• I have not and will not use an LLM to write any part of this PR description or PR comments.

Screenshots (if applicable)

[hgcummings]

Note: I haven't accounted for exclusions when calculating the rank for individual artist and album pages (https://github.com/gabehf/Koito/blob/main/internal/db/sqlite/artist.go#L90 and https://github.com/gabehf/Koito/blob/main/internal/db/sqlite/album.go#L104), i.e. albums/artists ranked lower than an excluded album/artist should arguably move up a place. I don't think the extra complexity serves any of the use cases described (which are about excluding niche artists/albums that will be ranked quite low anyway). Happy to do so though if you think it's worth it for the sake of consistency.