Support AlphaFold DB IDs as input (including complex entries)

[rdk]

Currently, users can specify an AlphaFold DB structure only by UniProt ID (for example, Q5VSL9), not by AlphaFold DB ID (for example, AF-Q5VSL9-F1-v6).

As a result, there is currently no way to run PrankWeb automatically on multimer complexes recently added to AlphaFold DB.

Example entry:
https://alphafold.ebi.ac.uk/entry/AF-0000000066503175

We should allow users to enter AF-0000000066503175 (or AF-0000000066503175-v1) and get an ad hoc or precomputed prediction for that exact entry, and possibly for that exact version.

Open questions

• Should version suffixes be accepted as part of the input and stored as part of the ID?
• What should be served if the user enters AF-Q5VSL9-F1-v6, but the latest precomputed version is AF-Q5VSL9-F1-v4?
• If precomputed predictions are stored under AFDB IDs (with or without version), what should be served when the user enters only a UniProt ID?

Context

• https://www.embl.org/news/science-technology/first-complexes-alphafold-database/
• https://research.nvidia.com/labs/dbr/assets/data/manuscripts/afdb.html
• https://www.nature.com/articles/d41586-026-00787-3