[PR] fix(ops): show the count in the alert rules pagination total [rocketmq-dashboard]

["zjncs (via GitHub)" <gi...@apache.org>]

zjncs opened a new pull request, #5616:
URL: https://github.com/apache/rocketmq-dashboard/pull/5616

   Closes #5615
   
   ## Problem
   
   `showTotal={(total) => t('alerts.totalRules', { count: total })}` passed `count` as a `t()` param, but the `totalRules` template has **no `{count}` placeholder** (`{ zh: '规则总数', en: 'Total Rules' }` — it doubles as the plain header-card label at line 918, where the count is a separate element). The i18n helper only substitutes `{key}` occurrences, so the count was silently dropped and the pagination showed "Total Rules" with no number — unlike every other paginated page (e.g. deliveries: `` showTotal: (count) => `${t('common.total')} ${count}` ``).
   
   ## Fix
   
   Append the count explicitly, keeping the domain label:
   
   ```tsx
   showTotal={(total) => `${t('alerts.totalRules')} ${total}`}
   ```
   
   ## Verification
   
   - New `AlertsPaginationTotal.test.tsx` (deterministic): renders the page with one rule and asserts the `.ant-pagination-total-text` contains a digit and the total — **FAILS on master** (label only, no number), **PASSES with this change** ("规则总数 1")
   - Regression: the existing `AlertsPage.test.tsx` suite 28/28 in isolation
   - Mutation check: reverting the one-line change makes the new test fail again; restoring it passes
   
   ## Collision note
   
   `alerts.tsx` is touched by several open PRs but none modifies this pagination line; the change is a single expression at ~1048 with a comment.


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