Add JavaScript benchmark data (200-task hard subset)

#1

200 JavaScript tasks selected by difficulty from Cybergym-Pro. Per task: vul/fix image archives (images/), per-level source snapshots (levels/level0-3/) and full source archives (source/), under javascript/benchmarks/tasks//. Non-archive materials live in GitHub SAIL-Research-Lab/Cybergym-Pro, branch cjl-js.

guan-wang changed pull request status to merged

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