[数据]: 多个贡献/城市/MX.json 中的系统性重复 wikiDataId（约 3,276 条记录，约占文件的 35%）

Summary While fixing #1623 (Epitacio Huerta misclassified state), a 4-record run (ids 70310 -70313) was found to share one incorrect wikiDataId — the result of what looks like a copy-forward bug during the original 2019 bulk import (see #1630, .GitHub/fixes-docs/FIX_1623_SUMMARY.md). Pullfrog's automated review of that PR flagged that this pattern is not isolated to those 4 records — it's systemic across the whole file. I independently re-verified the scan; the numbers below are mine, cross-checked against pullfrog's.