ui: bulk-edit edits cells in place instead of a stacked per-row form

"Изменить" previously replaced each camera row with a vertical .cam-edit-grid
form inside one colspan cell — effectively a different table. Now bulk edit
keeps the same columns and turns the cells into compact inline inputs:
Камера→name, IP→ip, Потоки→main/sub, Вкл/Запись toggles, Хранилище select,
and the Статус column becomes Логин/Пароль (header swaps via data-bulk-label).
Live per-row onchange is suppressed while bulk is active (changes collected
until Сохранить). Inputs are compact (22px) so row height stays dense.

VERSION 0.0.131.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/settings.html

@@ -56,7 +56,7 @@
           </div>
           <table class="cams">
             <thead>
-              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th style="width:150px">Хранилище</th><th>Статус</th><th></th></tr>
+              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th style="width:150px">Хранилище</th><th data-bulk-label="Логин / пароль">Статус</th><th></th></tr>
             </thead>
             <tbody id="cam-rows"></tbody>
           </table>