i18n(ja): unify the Japanese rendering of "execution plan"

[yahonda]

What is changed, added or deleted? (Required)

Standardizes the Japanese rendering of "execution plan" to 実行計画 (the established Japanese database term, matching the Oracle / PostgreSQL / SQL Server Japanese documentation) instead of the transliteration 実行プラン, which was the previous majority but not the conventional term.

Changed

• 実行プラン → 実行計画 (execution plan)
• クエリ実行プラン → クエリ実行計画 (query execution plan — still an execution plan; only the プラン/計画 spelling is unified, "query" is preserved)

Deliberately NOT changed

• クエリプラン (query plan): kept as-is. The English source distinguishes "query plan" (the optimizer's intermediate plan structure) from the final "execution plan" — e.g. sql-optimization-concepts.md: "TiDB obtains a query plan structure … and then obtains a final execution plan". Merging them would conflate two different concepts.
• 実行プランキャッシュ / 実行プランバインディング (plan cache / plan binding): excluded. These are separate terms with their own dominant standalone forms (プランキャッシュ, プランバインディング); unifying them here would create a new inconsistency. Left to their own future sweeps.

Section {#...} anchors are English-derived and unchanged, so all inbound links keep resolving.

Scope: 190 files (includes releases/, since this is pure term unification and unrelated to sentence structure).

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

What is the related PR or file link(s)?

• English source: https://github.com/pingcap/docs/blob/release-8.5/glossary.md

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[qiancai]

@yahonda, could you please resolve conflicts in this PR? Thanks.

[yahonda]

Rebased.

[qiancai]

@yahonda, sorry to bother you again. It looks like there are new conflicts in this PR. Could you please take a look? Thanks!

[yahonda]

Rebased.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-08-05 12:20:19.224448556 +0000 UTC m=+2617005.260543622: ☑️ agreed by qiancai.