Document what search score mean

[khoroshevskyi]

We should document somewhere what the score means; what is its range? From -1 to 1? Is it cosine similarity? Probably in the docstring on the search endpoint

[nsheff]

• also in the user interface, which is where most people will encounter this score

[khoroshevskyi]

Add docs to:

• Geniml docs
• Bedhost
• UI (small button)

[ClaudeHu]

I edited the doc of geniml on a newly created branch, which tells that the default distance metrics is cosine similarity, and also navigates to other distance options of Qdrant and hnswlib.