Bug: PDB file is named after UniProt, should also contain the source of the file

[berntpopp]

Description:
The current naming convention for PDB files only includes the UniProt ID. This makes it difficult to identify the source of the PDB file, such as AlphaFold or RCSB, which can create confusion when multiple PDB files are downloaded from different sources.

Expected Behavior:

• PDB file names should include both the UniProt ID and the source (e.g., P41227_alphafold.pdb or P41227_rcsb.pdb).

Proposed Solution:

• Modify the naming convention to append the source of the PDB file to the filename.