fix: strip mid-string U+FFFD in realtime decode emit

revert: preprocessor_config.json to stock (interpolation field was a no-op)

simplify: processing reduced to stock + only the <=8-D device-aware 10-D routing

Ascend NPU support: device-aware cache release, GIL-friendly idle wait, <=8-D vision processing, BICUBIC declaration

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