This fixes a bug where identical image duplicates were not being detected.
The implementation was incorrectly scanning the phash BLOB into a string and then attempting to parse it as a hex string. Since phashes are stored as 64-bit integers, they were being converted to decimal strings. For phashes with the MSB set (negative when treated as int64), the resulting decimal string started with a '-', which caused the hex parser to fail and skip the image entirely.
Additionally, even for non-negative phashes, parsing a decimal string as hex yielded incorrect hash values.
Scanning directly into the utils.Phash struct (which uses int64) matches how Scene phashes are handled and ensures the hash values are correct.
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