i18n(ja): restore literal column names in system-table reference tables

[yahonda]

What is changed, added or deleted? (Required)

The "column name" column of several system-table / SHOW-statement reference tables had the literal column identifiers translated into Japanese (e.g. オリジナルSQL, プランダイジェスト, sql_ダイジェスト, 状態, 作成時間, ソースファイルのサイズ). These are actual database output/column names and must stay as the literal English identifiers.

Restored the first column to the literal identifiers, matching the English source and the real column names (descriptions in the second column are left translated):

• sql-plan-management.md — original_sql / bind_sql / default_db / status / create_time / update_time / charset / collation / source / sql_digest / plan_digest
• sql-statements/sql-statement-show-bindings.md — same lower-case identifiers
• sql-statements/sql-statement-show-import-job.md — Status / Source_File_Size / Create_Time
• sql-statements/sql-statement-show-stats-meta.md — Update_time
• tidb-lightning/tidb-lightning-error-resolution.md — create_time

Descriptive table headers that merely happen to read like column names (e.g. 文字セット = "Character Set", オリジナル版 = "Original version") are not touched — those are normal header translations, not database identifiers.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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

• This PR is translated from: N/A (Japanese-only fix; no English source change)
• Other reference link(s): part of the i18n-ja-release-8.5 machine-translation cleanup series. Note: sql-plan-management.md is also edited by the dropped-text PR on nearby table rows (different column), so whichever merges second needs a trivial one-file rebase.

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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