fix(ui): submit the inline cards from every field, not from a hand-written roster

[argszero]

Summary

The inline form cards — #topup-card, #raise-card, #dept-form-card, #model-form-card,
#ak-new-inline — are <div class="form"> / <span class="inline-edit">, not real <form>s
(the real one is #share-form, where a type="submit" button gives every field Enter for free).
So Enter had to be implemented by hand, and it was implemented as a per-field roster:

$("#model-form-provider").addEventListener("keydown", ... $("#model-confirm").click());
$("#model-form-model").addEventListener("keydown", ...);   // and that is the whole list

The model form has ten text controls. The roster named two, so the other eight — input price,
cache-hit price, output price, all three peak prices, context window, max output — did nothing on
Enter, while all ten submit when you click Confirm. Nothing errors; the card just ignores the key.
The department form on the same page registered every field it has (2/2) and #share-form needs
no registration at all, so this is an omission rather than a trade-off.

A roster is the problem, not its entries: it does not grow when the markup does. The fix deletes
it and delegates Enter to the card, so every text control the card has — today's and tomorrow's —
is covered:

wireEnterSubmit($("#model-form-card"), "#model-confirm");

The delegate bails on non-text targets, so pressing Enter while the Cancel button has focus
still dismisses the card instead of submitting it, and it only calls btn.click() — busy state
(withLoading), validation and the request stay in the confirm button's own listener.

Related Issue

Changes

• UI fix: Enter submits from any field of the inline cards; the per-field roster is gone
  (ui/js/app.js)
• CI test pins the shape, with detector controls (src/i18n_pack.rs)
• Rule + smoke-test notes recorded (ui/README.md)
• cache-bust ui/index.html
• No configuration / data-structure changes

Tests

• cargo test 全部通过 (260 passed, 0 failed)
• cargo fmt --check 通过
• cargo clippy 无新增 warning (only the pre-existing collapsible_match false positive at
  src/protocol.rs:662 on the local 1.95 toolchain; CI's stable is authoritative)
• 新增 CI 测试 src/i18n_pack.rs::enter_submit_is_delegated_to_the_card

Runtime verification (jsdom over the real ui/index.html + four real scripts, only fetch
stubbed, driven through the real login form and the real nav). Every control runs the same
submission twice — leg A presses Enter in the control, leg B clicks the confirm button with
identical field values — so each control carries its own positive control against "this form
could not submit with these values anyway":

live (this tree)                              passed=23/23  reds={}
pre-fix tree (6e022e1)                        passed=21/23  reds={S1b B1:model-form-card}
  -> 8 of 10 controls: Enter fired nothing, the click fired POST /api/admin/models
guard removed (delegate fires on any Enter)   reds={D2:model-form-card D2:topup-card}
  -> Enter on the Cancel button submits the card

The two legs turn disjoint sets red, and the pre-fix red set is exactly the axis. The guardless
leg pins the direction: deleting the roster is not enough on its own — the delegate must also keep
"only text inputs submit" true.

Checklist

• 分支命名符合约定 (fix/...)
• Commit message 使用 Conventional Commits 格式
• 单一职责，改动最小化 (4 files, one behaviour)