Add uniprot backend for gene annotation

[ivokwee]

Summary

Adds UniProt as a third gene annotation backend (alongside AnnotationHub and g:Profiler), used as a fallback for organisms/probe types the other two backends don't cover well (e.g. hamster).

• getGeneAnnotation.UNIPROT(): annotates probes via UniProt.ws::mapUniProt(). Detects probe type (Ensembl gene/transcript/protein, RefSeq protein, UniProt accession, Entrez ID) via regex sniffing (detect_probetype.UNIPROT()), then filters results to the target organism since mapUniProt() has no taxId argument.
• getExampleFeatures.UNIPROT(): last-resort fallback for example features when an organism has no OrgDb package and no g:Profiler entry — samples UniProt accessions directly via UniProt.ws::UniProt.ws().
• Wires "uniprot" into the methods list for getGeneAnnotation() and getProbeAnnotation().
• .map_gprofiler_id.SPECIES_TABLE(): looks up the g:Profiler species ID from the bundled SPECIES_TABLE before falling back to the remote g:Profiler organism list API call.
• Fixes a copy-paste bug in getGeneAnnotation.ANNOTHUB() that nulled ortholog/orthologs twice instead of human_ortholog/human_orthologs.

Test plan

• make test filter=pgx-annot
• Manually verify annotation for a hamster (or other OrgDb-less) dataset resolves gene symbols via the UniProt backend

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