Optimize ignored frequency matching - #136
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Filter ignores to scanned ranges, pre-merge overlapping intervals in memory, and look them up with binary search so the config list itself stays unmerged.
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Ignored frequencies are now prepared once at startup: keep only ranges that overlap scanned frequencies, merge overlapping/adjacent intervals in memory, and match with binary search. The ignore list in config is left unchanged. This avoids rebuilding and linearly scanning the full list on every FFT bin.