i18n(ja): fix 14 more adjacent-bold-span defects across 13 files

[yahonda]

Summary

Continuation of the adjacent-bold-span defect sweep (see #23547/#23548 for the earlier two large clusters). Each of these is an EN sentence with two distinct bold terms joined by a connector word (and/or/as/to/etc.) where JA had trapped that connector word (a particle or conjunction) inside the closing/opening ** markers instead of leaving it as plain text between the two spans.

Files fixed (1 line each unless noted):

• tidb-troubleshooting-map.md — Grafana breadcrumb (Grafana -> **TiDB** and **TiKV**)
• auto-increment.md — unique and monotonically increasing
• develop/dev-guide-gui-mysql-workbench.md — SQL Editor > MySQL Session
• develop/dev-guide-create-table.md (2 lines) — primary key/clustered index, columns/primary keys
• develop/dev-guide-sample-application-nodejs-prisma.md — "recommend" phrasing
• develop/dev-guide-sample-application-nodejs-mysql2.md + nodejs-mysqljs.md — MUST-enable phrasing (also now matches the established corpus convention of bolding 必要があります as one unit)
• develop/dev-guide-sample-application-ruby-mysql2.md — same MUST phrasing plus a trailing but/が particle
• ticdc/ticdc-summary-monitor.md — Sink flush rows/s vs Puller output events/s
• tidb-cloud/backup-and-restore.md — date and time selection (kept as a single natural 日時 term per corpus convention, particle moved outside)
• tidb-cloud/integrate-tidbcloud-with-airbyte.md — reconstructed the "Set up source/destination" sentence into two clean quoted spans
• tiflash/tiflash-disaggregated-and-s3.md — disaggregated vs coupled architecture
• dashboard/dashboard-session-sso.md — reconstructed the Auth0 Client ID sentence to match this file's own established convention (OIDC クライアント ID kept as katakana, NOT English, unlike the TiDB Cloud console UI-label campaign — verified against 3 other occurrences in the same file before assuming English was correct)

Explicitly skipped (already fixed by sibling PR #23535, still open — verified via git show origin/<branch>:<file> before starting, to avoid duplicate/conflicting work): tidb-cloud/dedicated-external-storage.md (Storage Provider/Amazon S3) and tidb-cloud/data-service-get-started.md (+ Create Endpoint).

Side finding, not fixed here: while checking for conflicts, found that 5 other open PRs (#23535, #23543, #23545, #23547, #23548 — including my own #23547/#23548) are now stale against the current upstream tip (several sibling PRs merged since they were branched) and will need a rebase before they can merge cleanly. Flagging for whoever sequences the merge order; out of scope for this small fix.

Test plan

• 0 bracket/**-parity issues in the diff (automated check)
• Every fix verified 1:1 against EN, including checking established per-file JA conventions (e.g. dashboard-session-sso.md keeps OIDC terms in katakana)
• Confirmed via git merge-tree that none of these 14 lines participate in any conflict with the 5 sibling branches checked

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Timeline:

• 2026-08-18 06:14:05.549462304 +0000 UTC m=+3718231.585557360: ☑️ agreed by qiancai.