i18n(ja): restore @[handle] author-link format in release notes

[yahonda]

What is changed, added or deleted? (Required)

The machine translation inserted a stray space into GitHub author-attribution links, rendering them as @ [handle](url) (which displays as "@ handle") instead of the English-source form @[handle](url) ("@handle"). The English source never uses the spaced form (0 occurrences; @[ everywhere).

This PR removes the space in every @ [handle](https://github.com/...) author link. It is purely mechanical and verified to be exactly the @ [ → @[ transform (base + transform == result, 0 other changes).

Scope: 3382 author links across 46 files (mostly releases/*.md, plus a few non-release contributor lists).

Out of scope (separate/earlier work):

• Mid-sentence scrambled links → already fixed in i18n(ja): fix scrambled issue/author links in release notes #23423 (merged).
• Full-width issue-ref markers ＃ → intentionally left as-is.
• A few pre-existing malformed author links (missing @, concatenated handles) are not touched here.

Note: this shares some releases/*.md lines with open PRs #23408 (execution-plan term) and #23409 (HTML entities); since the changes are on different tokens of the same lines, whichever merges first, the other is rebased cleanly.

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

• master (the latest development version)
• v8.5 (TiDB 8.5 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)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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

Follow-up to #23423 (release-note scramble fix).

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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[LGTM Timeline notifier]

Timeline:

• 2026-08-04 06:05:51.568734825 +0000 UTC m=+2508137.604829881: ☑️ agreed by qiancai.