docs(ui): complete four stale capability lists in ui/README.md

[argszero]

Summary

ui/README.md has four subsections that enumerate a capability (a coverage list, a call-site count, a table roster, a renderer's content list). Each was written when it was true and was never extended when a later feature landed, so it now states a list or count the code no longer matches. This PR corrects the four values to what the code implements. Documentation only — no code, no gate.

Related Issue

None (self-found during a documentation audit; no tracking issue exists).

Changes

• Four value corrections in ui/README.md, one per stale subsection:
  • inline-confirm coverage list (已覆盖) omitted model deletion — ui/js/app.js calls confirmInline(..., deleteModel(…)) alongside key/sharing/department deletion. Added 模型删除.
  • timeCell call-site count said "two call sites" (transactions / API Key) — there are three: the raise-request list's created_at (ui/js/app.js, admin.raise row) is the third. Corrected to 交易/API Key/加额申请三个调用点.
  • data-label table roster omitted the admin model table (#model-body), while the same file's keyboard-navigation section already lists model-body — a self-contradiction. Added 模型.
  • mkDetailHtml content list omitted peak-hour pricing — the renderer appends it conditionally (if (m.peak), ui/js/app.js:863), exactly like the sibling conditional m.multi which is listed. Added 高峰时段价（仅 m.peak 显示…）.
• No configuration/data-structure changes, so no example-file sync is required.

Tests

• cargo test — 426 passed; 0 failed
• cargo fmt --check — clean (rc 0)
• cargo clippy --all-targets -- -D warnings — clean (rc 0)
• New/updated unit tests — not applicable: ui/README.md is prose, and the repo's settled convention for this class (doc-comment-claims axis) is to fix the value, not to add a gate. Precedents: docs(perf_gate): drop the stale file count from the gate header #309/docs(ui): stop restating the i18n counters and correct two stale gate claims #310/docs(ui): describe the recent-models store the code actually keeps #313/docs(ui): describe the login page the two-column redesign left behind #314/docs(ui): name only the bump sites, test and hint the code still has #315/docs(ui): stop claiming a .bar-label alias the stylesheet no longer has #317/docs(ui): name the operator card the way the code names it #319/fix(i18n): drop the retired "shown once" claim from the generate-key toast #320/docs(ui): name the translator helper the code actually declares #322/docs(ui): state the inlineForm validate contract the code implements #324.

Checklist

• Branch name follows the convention (docs/<description>)
• Commit message uses Conventional Commits (docs(ui): …)
• Single responsibility, minimal change (1 file, +4/−4)

[argszero]

Self-review (committer, allow_self_merge: true).

Verified against the tree this branch is based on (dee6a24):

1. confirmInline call sites in ui/js/app.js: sharing (4167), API key (4284), department (4354), model (4377) — four; the old list named three.
2. timeCell calls: raise-request created_at (1445), transactions time column (1485), API Key last-used (2408) — three; the old text said two. (:3221 is the definition.)
3. The data-label roster now matches the same file's keyboard-nav section, which already listed model-body (admin model table, ui/index.html:701) — the file no longer contradicts itself.
4. mkDetailHtml appends peak-hour pricing conditionally (if (m.peak), ui/js/app.js:863), the same shape as the already-listed m.multi.

ui/README.md is include_str! corpus, so the full suite was re-run: cargo test 426/0, cargo fmt --check rc 0, cargo clippy --all-targets -- -D warnings rc 0.

Documentation-only change; no gate added, consistent with the repo's doc-comment-claims convention.