fix(ui): explain the REALITY client version gate and drop the impossible placeholder (#6125)

* fix(ui): explain the REALITY client version gate and drop the impossible placeholder

An empty Min Client Ver looks unrestricted, but Xray-core silently
falls back to a built-in minimum (currently 26.3.27) that rejects
third-party cores such as Mihomo and sing-box with a bare REALITY
verification failure, and nothing in the panel points at the field.
Add tooltips to both version fields explaining the fallback and its
TLS-fingerprint-freshness rationale.

The Max Client Ver placeholder (25.9.11) sat below the built-in
minimum, so filling in both placeholders produced a range that
rejects every client. Remove it; empty genuinely means no upper
limit for that field.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(reality): warn that an empty min client version rejects old cores

Common pitfalls covered bad targets, SNI mismatches, leaked keys and
wrong flow, but not the client version gate that currently bites
Mihomo and sing-box users. Add it to all four doc languages.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(ui): word the version hints against the effective minimum

Address the automated review: the Max Client Ver hint said only 'not
lower than Min Client Ver', which re-establishes the empty-means-unset
mental model when the effective floor is the core's built-in minimum.
Both hints now name the effective minimum and tie the quoted 26.3.27
to the core build the panel runs, since operators can install any
Xray-core version.

Also from review: full-width quotes and a missing verb in the zh doc
bullet, the idiomatic Arabic opening, and a format-only x.y.z
placeholder on Max Client Ver so the field still conveys its shape.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

internal/web/translation/zh-CN.json

@@ -656,6 +656,8 @@
         "maxTimeDiff": "最大时间差 (ms)",
         "minClientVer": "最小客户端版本",
         "maxClientVer": "最大客户端版本",
+        "minClientVerHint": "留空不等于不限制：Xray-core 会改用所运行内核版本的内置最低值（当前版本为 26.3.27），拒绝自报版本更低的客户端——包括 Mihomo、sing-box 等第三方内核。填 1.0.0 可放行它们，代价是允许过时的 TLS 指纹。",
+        "maxClientVerHint": "留空表示无上限。若填写，不得低于实际生效的下限——最小客户端版本，该字段留空时则为 Xray-core 的内置最低值——否则所有客户端都会被拒绝。",
         "shortIds": "Short IDs",
         "realityTargetHint": "必填。必须包含端口（例如 example.com:443）。没有端口时 Xray-core 将无法启动。",
         "realityTargetRequired": "REALITY 目标为必填项",