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/backend/apps/ops/views.py

@@ -2,9 +2,17 @@ from django.db.models import Q
 from django.utils import timezone
 from rest_framework import status
 from rest_framework.decorators import action
+from rest_framework.pagination import PageNumberPagination
 from rest_framework.response import Response
 from rest_framework.viewsets import ModelViewSet
 
+
+class NotificationPagination(PageNumberPagination):
+    # 收件箱滚动加载:每批 10 条,前端可用 ?page_size= 覆盖(上限 100)
+    page_size = 10
+    page_size_query_param = "page_size"
+    max_page_size = 100
+
 from apps.assets.models import Asset
 from apps.billing.models import CreditAccount
 from apps.common.api import TeamScopedViewSetMixin
@@ -109,14 +117,19 @@ def ensure_team_notifications(team, user):
 class NotificationViewSet(TeamScopedViewSetMixin, ModelViewSet):
     serializer_class = NotificationSerializer
     queryset = Notification.objects.select_related("team", "recipient", "project").all()
+    pagination_class = NotificationPagination
     search_fields = ["title", "brief", "body", "source", "stage"]
     ordering_fields = ["created_at", "updated_at"]
     ordering = ["-created_at"]
 
-    def get_queryset(self):
+    # 团队 + 收件人 + 未归档:分类计数的基准集(不含 tab/未读/搜索过滤)
+    def _recipient_scope(self):
         queryset = super().get_queryset().filter(archived_at__isnull=True)
         user = self.request.user
-        queryset = queryset.filter(Q(recipient=user) | Q(recipient__isnull=True))
+        return queryset.filter(Q(recipient=user) | Q(recipient__isnull=True))
+
+    def get_queryset(self):
+        queryset = self._recipient_scope()
         notification_type = self.request.query_params.get("type")
         if notification_type and notification_type not in {"all", "unread"}:
             queryset = queryset.filter(notification_type=notification_type)
@@ -128,9 +141,19 @@ class NotificationViewSet(TeamScopedViewSetMixin, ModelViewSet):
         ensure_team_notifications(self.get_team(), request.user)
         response = super().list(request, *args, **kwargs)
         data = response.data
-        unread_count = self.get_queryset().filter(is_read=False).count()
         if isinstance(data, dict):
+            # 分类 chip 计数取绝对总数(忽略当前 tab/搜索),与设计稿一致
+            base = self._recipient_scope()
+            unread_count = base.filter(is_read=False).count()
             data["unread_count"] = unread_count
+            data["type_counts"] = {
+                "all": base.count(),
+                "unread": unread_count,
+                "task": base.filter(notification_type="task").count(),
+                "team": base.filter(notification_type="team").count(),
+                "billing": base.filter(notification_type="billing").count(),
+                "system": base.filter(notification_type="system").count(),
+            }
         return response
 
     def perform_create(self, serializer):