[Feature - Implemented] Add sample rate filter to search

[azolash]

I've implemented and tested a sample rate filter for search results:

• Adds "Min Sample Rate" input field in search options
• Filters files by minimum sample rate (in kHz)
• Supports common rates (44.1, 48, 88.2, 96, 192 kHz)
• can use minsamplerate or minsr (similar to the already existing filter minbitrate and minbr)

Would you be interested in a pull request for this feature?

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