feat(core): notification inbox infinite scroll + command palette fix (+ pending WIP)

消息中心:全量渲染 → 真·后端分页滚动加载
- backend(ops/views): NotificationPagination(10/页,page_size 可覆盖)+
  响应回 type_counts(按收件人绝对计数,不受分页/搜索影响)
- frontend(messages): 自管分页,滚到底加载下一批;tab/搜索走服务端并重置到第1页;
  代号作废在途旧请求防切换卡空白;乐观标已读;「已加载 X / Y」分母用当前筛选总数
- api/App/types: listNotifications 支持 page/page_size/search;allNotifications 携带 type_counts

命令面板(侧边栏搜索):修复点开后 UI 错位
- app-shell: 遮罩 className 漏了基类 shell-command-bg(只有 .show)致无定位塌到左下;
  补回基类 + header 类名对齐 .shell-command-h
- messages-page.css: 工作台收进视口高度,收件箱在面板内滚动

本次提交一并带入此前若干未提交 WIP(account/ai-tools/library/pipeline/products/settings +
accounts/ai/assets/billing/projects 后端),按用户要求整体推 dev。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/account-page.css

@@ -97,8 +97,8 @@
 
   .trend-chart { display: grid; grid-template-rows: 1fr auto; gap: 6px; min-height: 170px; flex: 1; padding: 6px 4px 2px; position: relative; }
   .trend-chart .bars { display: grid; grid-template-columns: repeat(14, 1fr); gap: 5px; align-items: end; height: 100%; }
-  .trend-chart .bar { background: var(--background-lighter); border-radius: 2px 2px 0 0; position: relative; transition: background var(--t-base); cursor: pointer; }
-  .trend-chart .bar > span { display: block; width: 100%; background: var(--heat); border-radius: 2px 2px 0 0; }
+  .trend-chart .bar { background: var(--background-lighter); border-radius: 2px 2px 0 0; position: relative; transition: background var(--t-base); cursor: pointer; height: 100%; }
+  .trend-chart .bar > span { position: absolute; left: 0; bottom: 0; display: block; width: 100%; flex: none; min-height: 0; background: var(--heat); border-radius: 2px 2px 0 0; }
   .trend-chart .bar:hover > span { background: var(--accent-black); }
   .trend-chart .bar.peak > span { background: var(--accent-black); }
   .trend-chart .x-axis { display: grid; grid-template-columns: repeat(14, 1fr); gap: 5px; font-family: var(--font-mono); font-size: 9.5px; color: var(--black-alpha-32); text-align: center; letter-spacing: .02em; }
@@ -127,14 +127,23 @@
   .quota-rules .step .formula { font-family: var(--font-mono); font-size: 11.5px; color: var(--heat); background: var(--heat-12); padding: 0 4px; border-radius: var(--r-sm); }
 
   .billing-table { width: 100%; border-collapse: separate; border-spacing: 0; background: var(--surface); border: 1px solid var(--border-muted); border-radius: var(--r-md); overflow: hidden; }
-  .billing-table th, .billing-table td { padding: 11px 14px; text-align: left; font-size: 12.5px; border-bottom: 0; }
+  .billing-table th, .billing-table td { padding: 13px 16px; text-align: left; font-size: 12.5px; border-bottom: 0; }
   .billing-table thead th { background: var(--background-lighter); border-bottom: 1px solid var(--border-muted); font-family: var(--font-mono); font-size: 10.5px; font-weight: 500; color: var(--black-alpha-48); letter-spacing: .04em; text-transform: uppercase; }
+  /* 行间淡分隔线,长流水更易扫读;最后一行不画 */
+  .billing-table tbody td { border-bottom: 1px solid var(--border-faint); }
+  .billing-table tbody tr:last-child td { border-bottom: 0; }
   .billing-table tbody tr:hover { background: var(--background-lighter); }
   .billing-table .ts { font-family: var(--font-mono); font-size: 11px; color: var(--black-alpha-48); letter-spacing: .02em; }
   .billing-table .neg { font-variant-numeric: tabular-nums; font-weight: 500; color: var(--accent-black); text-align: right; }
   .billing-table .pos { font-variant-numeric: tabular-nums; font-weight: 500; color: var(--accent-forest); text-align: right; }
   .billing-table .zero { font-variant-numeric: tabular-nums; font-weight: 500; color: var(--black-alpha-32); text-align: right; }
+  /* 已用 / 月度额度:已用部分本色,额度部分弱化,整列左对齐 */
+  .billing-table .quota { font-variant-numeric: tabular-nums; text-align: left; }
+  .billing-table .quota .used { font-weight: 500; color: var(--accent-black); }
+  .billing-table .quota .lim { color: var(--black-alpha-32); }
   .billing-table .muted { color: var(--black-alpha-56); font-size: 11.5px; }
+  /* 系统流水(无成员):弱化的 mono 占位,不喧宾夺主 */
+  .billing-table .sys { font-family: var(--font-mono); font-size: 11px; color: var(--black-alpha-32); }
   .billing-table .ref { color: var(--black-alpha-48); font-size: 10.5px; font-family: var(--font-mono); }
   .billing-table .who { display: inline-flex; align-items: center; gap: 8px; }
   .billing-table .who .av { width: 24px; height: 24px; border-radius: 50%; background: var(--background-lighter); border: 1px solid var(--border-faint); display: inline-grid; place-items: center; font-size: 11px; font-weight: 600; color: var(--accent-black); }
@@ -150,6 +159,15 @@
   .billing-table .status-tag.ok { background: rgba(66,195,102,.12); color: var(--accent-forest); }
   .billing-table .status-tag.wip { background: var(--heat-12); color: var(--heat); }
   .billing-table .status-tag.fail { background: rgba(235,52,36,.10); color: var(--accent-crimson); }
+
+  .bill-pager { display: flex; align-items: center; gap: 12px; margin-top: 14px; font-size: 12px; }
+  .bill-pager .total { font-family: var(--font-mono); font-size: 10.5px; color: var(--black-alpha-48); letter-spacing: .02em; }
+  .bill-pager .pages { display: inline-flex; gap: 4px; margin-left: auto; }
+  .bill-pager .pages button { min-width: 28px; height: 28px; padding: 0 8px; border: 1px solid var(--border-muted); border-radius: var(--r-sm); background: var(--surface); font-family: var(--font-mono); font-size: 11px; color: var(--black-alpha-56); cursor: pointer; transition: border-color var(--t-base), color var(--t-base), background var(--t-base); }
+  .bill-pager .pages button:hover:not(.active):not(:disabled) { border-color: var(--black-alpha-32); color: var(--accent-black); }
+  .bill-pager .pages button.active { background: var(--heat); color: var(--accent-white); border-color: var(--heat); font-weight: 600; }
+  .bill-pager .pages button:disabled { opacity: .4; cursor: not-allowed; }
+  .bill-pager .pages .ellipsis { min-width: 20px; height: 28px; display: inline-flex; align-items: flex-end; justify-content: center; padding-bottom: 4px; color: var(--black-alpha-32); font-family: var(--font-mono); font-size: 11px; user-select: none; }
   .billing-table .progress-mini { width: 80px; height: 4px; background: var(--background-lighter); border-radius: 2px; overflow: hidden; display: inline-block; vertical-align: middle; margin-left: 8px; }
   .billing-table .progress-mini > span { display: block; height: 100%; background: var(--heat); }