i18n(ja): normalize katakana rendering of 'binlog position' to the established kanji term

[yahonda]

Summary

The established ja term (定訳) for "position" — especially "binlog position" — is 位置, not katakana ポジション (225 occurrences of 位置 corpus-wide vs 4 of ポジション, only 2 of which are binlog-related, both in dm/monitor-a-dm-cluster.md).

EN's row label here is "binlog pos", one of several metric-table row labels translated into natural Japanese elsewhere in the same table (e.g. "storage capacity" → ストレージ容量), so 位置 fits the established pattern.

Note: a separate 「ポジション」 occurrence in tidb-scheduling.md is a different concept (TiKV peer/topology placement, not binlog position) and is intentionally left untouched.

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Timeline:

• 2026-08-17 10:00:58.053069552 +0000 UTC m=+3645444.089164608: ☑️ agreed by qiancai.