fix(ui): drop two false/stale static i18n fallbacks in index.html

[argszero]

Summary

ui/index.html stores every data-i18n string twice: as the element's static text (the fallback) and in the pack (ui/js/i18n.js). applyStatic() (ui/js/i18n.js:1745) replaces the element with the pack value on DOMContentLoaded, so the static fallback is normally not displayed — but it is still a second source of truth, and two of its entries assert things that are no longer true. This PR fixes exactly those two.

Related Issue

No linked issue — found during repository recon.

Changes

• ops.hours.sub static text: 按小时用量记录 · 本地时区 → 按小时用量记录 · 服务端 UTC 时区.
  The backend buckets today_hours by UTC (src/routes/ops.rs:5 「按小时用量记录…UTC 小时」, :115 「小时口径 = UTC（库内 time 为 datetime('now')）」) and the pack already said 「服务端 UTC 时区」 — so the fallback asserted a false fact. Introduced already-contradictory in 09e4121 (feat(ui): redesign settings/admin/ops views on the landed component layer #157): the 本地时区 static text and the UTC pack text land in the same commit.
• settings.ep.note static text: 部署后替换为你的网关域名（原型占位说明） → the pack text 端点来自服务端配置 public_url；生产部署请在 config 中设为你的网关域名.
  The fallback was a verbatim copy of the prototype (docs/prototype/aitokenpool-console.html:705), its 「原型占位说明」 marker included. The endpoint card became config-driven in e74f7fc (feat: configurable gateway public_url for settings endpoints (v0.6.3) #96) and the pack was updated then; only the static fallback was left behind.

Both static strings are now byte-identical to their pack entry. Data-only (HTML text), zero behaviour change — the rendered UI already showed the pack value, so no user-visible output changes.

• 功能/修复说明：如上
• 涉及配置/数据结构的改动已同步示例文件：不适用（无配置/数据结构改动；无 i18n 键增删，786 键前后一致）

Tests

• cargo test 全部通过 — 188 passed（数量不变，正说明没有行为移动）
• cargo fmt --check 通过
• cargo clippy --all-targets -- -D warnings 干净
• Manual check: the two static strings now compare equal to their ZH pack entries; the fallback-vs-pack probe's divergence count drops 16 → 14 and both fixed keys leave the list
• 未新增单元测试：本次改动只有 HTML 文本，而 src/i18n_pack.rs 门禁的既有不变量是「键可解析」而非「文本相等」——文本相等对其余键本来就不成立（如 view.wallet.sub 的「提现 / 申请加额」两种措辞都成立），因此不适合作为断言。

Checklist

• 分支命名符合约定（fix/）
• Commit message 使用 Conventional Commits 格式（fix(ui):）
• 单一职责，改动最小化（1 文件 2 行；无新增/删除 i18n 键；未改 JS/CSS，故无需 cache-bust）

Non-goals

• 不批量对齐其余 fallback 措辞差异（login.email、share.add、view.wallet.sub 等）：fallback 保留旧措辞本就是它的用途，只有「假/陈旧」才是缺陷。
• 不新增「静态文本 = 包值」门禁（理由见上）。