fix(search): parse tika xmpDM:duration as a float

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Tika emits xmpDM:duration as seconds in floating-point form (for
example "154.57379150390625"), so strconv.ParseInt rejected every
value and the field was silently dropped — every indexed audio item
ended up without a duration.

Parse the value with strconv.ParseFloat and convert to milliseconds
ourselves. Adjust the existing extractor test to cover the fractional
case.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f