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/billing/serializers.py

@@ -11,11 +11,15 @@ class CreditAccountSerializer(serializers.ModelSerializer):
 
 
 class CreditLedgerSerializer(serializers.ModelSerializer):
+    # 成员展示名:优先真实姓名 → 用户名 → 邮箱;系统流水(无 user)留空
+    user_label = serializers.SerializerMethodField()
+
     class Meta:
         model = CreditLedger
         fields = [
             "id",
             "user",
+            "user_label",
             "project",
             "task",
             "ledger_type",
@@ -27,6 +31,12 @@ class CreditLedgerSerializer(serializers.ModelSerializer):
         ]
         read_only_fields = fields
 
+    def get_user_label(self, obj):
+        user = obj.user
+        if user is None:
+            return ""
+        return user.first_name or user.username or user.email or ""
+
 
 class CreditReservationSerializer(serializers.ModelSerializer):
     class Meta:

core/backend/apps/billing/services/ledger.py

@@ -29,7 +29,7 @@ def reserve_credit(*, team, user, task, amount: Decimal) -> CreditReservation:
         ledger_type=CreditLedger.Type.RESERVE,
         amount=amount,
         balance_after=account.balance,
-        reason="reserve ai task credit",
+        reason="AI 任务预扣额度",
     )
     return reservation
 
@@ -52,7 +52,7 @@ def release_credit(*, reservation: CreditReservation, reason: str = "") -> None:
         ledger_type=CreditLedger.Type.RELEASE,
         amount=reservation.amount,
         balance_after=account.balance,
-        reason=reason or "release reserved credit",
+        reason=reason or "释放预留额度",
     )
 
 
@@ -77,7 +77,7 @@ def charge_reserved_credit(*, reservation: CreditReservation, actual_amount: Dec
         ledger_type=CreditLedger.Type.CHARGE,
         amount=actual_amount,
         balance_after=account.balance,
-        reason="charge ai task credit",
+        reason="AI 任务扣费",
     )
     if reservation.amount > actual_amount:
         CreditLedger.objects.create(
@@ -88,6 +88,6 @@ def charge_reserved_credit(*, reservation: CreditReservation, actual_amount: Dec
             ledger_type=CreditLedger.Type.RELEASE,
             amount=reservation.amount - actual_amount,
             balance_after=account.balance,
-            reason="release unused reserved credit",
+            reason="释放未用预留额度",
         )
 

core/backend/apps/billing/views.py

@@ -56,7 +56,27 @@ def ledgers(request):
         queryset = queryset.filter(project_id=project_id)
     if user_id:
         queryset = queryset.filter(user_id=user_id)
-    return Response(CreditLedgerSerializer(queryset[:100], many=True).data)
+    # 服务端分页:总数随流水增长(原先写死 [:100] 导致永远 100 条)
+    try:
+        page = max(1, int(request.query_params.get("page", 1)))
+    except (TypeError, ValueError):
+        page = 1
+    try:
+        page_size = int(request.query_params.get("page_size", 10))
+    except (TypeError, ValueError):
+        page_size = 10
+    page_size = max(1, min(page_size, 100))
+    total = queryset.count()
+    start = (page - 1) * page_size
+    rows = queryset[start:start + page_size]
+    return Response(
+        {
+            "count": total,
+            "page": page,
+            "page_size": page_size,
+            "results": CreditLedgerSerializer(rows, many=True).data,
+        }
+    )
 
 
 @api_view(["POST"])