feat(server): support query overcapacity member count of workspace (#12050)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Workspace quota information now includes a new metric: the count of members exceeding seat capacity ("overcapacityMemberCount"), available in both numeric and human-readable formats.
  - The workspace quota display and related queries have been updated to show this new overcapacity member count alongside existing quota metrics.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/core/quota/service.ts

@@ -142,12 +142,16 @@ export class QuotaService {
     const usedStorageQuota = quota.ownerQuota
       ? await this.getUserStorageUsage(quota.ownerQuota)
       : await this.getWorkspaceStorageUsage(workspaceId);
-    const memberCount = await this.models.workspaceUser.count(workspaceId);
+    const memberCount =
+      await this.models.workspaceUser.chargedCount(workspaceId);
+    const overcapacityMemberCount =
+      await this.models.workspaceUser.insufficientSeatMemberCount(workspaceId);
 
     return {
       ...quota,
       usedStorageQuota,
       memberCount,
+      overcapacityMemberCount,
       usedSize: usedStorageQuota,
     };
   }
@@ -203,6 +207,7 @@ export class QuotaService {
       historyPeriod: formatDate(quota.historyPeriod),
       memberLimit: quota.memberLimit.toString(),
       memberCount: quota.memberCount.toString(),
+      overcapacityMemberCount: quota.overcapacityMemberCount.toString(),
     };
   }
 

packages/backend/server/src/core/quota/types.ts

@@ -85,6 +85,9 @@ export class WorkspaceQuotaHumanReadableType {
 
   @Field()
   memberCount!: string;
+
+  @Field()
+  overcapacityMemberCount!: string;
 }
 
 @ObjectType()
@@ -110,6 +113,9 @@ export class WorkspaceQuotaType implements Partial<WorkspaceQuota> {
   @Field()
   memberCount!: number;
 
+  @Field()
+  overcapacityMemberCount!: number;
+
   @Field()
   humanReadable!: WorkspaceQuotaHumanReadableType;