Feature Request: Batch Verification of PAR2 Files Themselves

I periodically verify PAR2 files on a shorter cycle, and verify the protected files on a longer cycle. Currently, `queue_verify.py` verifies both the PAR2 files and the associated protected files together. On mechanical hard drives, this results in significantly longer verification times. **Suggestions:** * Add an option to **verify only the PAR2 files themselves**, without checking the protected files This would greatly reduce verification time for routine integrity checks. * Improve handling of separated file structures: I typically store `.vol*+*.par2` files in a separate directory, while hashes and protected files are kept together elsewhere for better organization. In this case, the tool reports missing protected files as errors. * Please add an option to **ignore missing protected files** when none are found * This would prevent excessive and unnecessary error reports in such setups