chore: add bare timeseries tag, remove ineffective modality field

chore: fix modality field, drop modality tag, sync language

chore: translate to English, sync source metadata, add format:tsfile tag

chore: translate README to English and add format:tsfile tag

chore: normalize tsfile dataset metadata

Upload README.md with huggingface_hub

Re-encode TsFile with type-based encodings + LZ4 (smaller size)

Add TsFile (converted from juliensimon/geomagnetic-kp-index)

initial commit