feat(platform): harden governance and approval workflows

Tiku.Api/Controllers/PlatformOperationsController.cs

@@ -4,6 +4,7 @@ using Tiku.Api.Contracts;
 using Tiku.Application.Jobs;
 using Tiku.Application.Security;
 using Tiku.Domain.Operations;
+using Tiku.Domain.Platform;
 using Tiku.Application.Assets;
 using Tiku.Application.Storage;
 using Tiku.Infrastructure.Persistence;
@@ -119,6 +120,26 @@ public sealed class PlatformOperationsController(
         });
     }
 
+    [HttpGet("governance-metrics")]
+    [EndpointSummary("查询审批、配置与通知治理指标")]
+    public async Task<ActionResult<object>> GovernanceMetrics(CancellationToken cancellationToken)
+    {
+        var now = DateTimeOffset.UtcNow;
+        var approvalCounts = await dbContext.PlatformApprovalRequests.AsNoTracking()
+            .GroupBy(item => item.Status)
+            .Select(group => new { status = group.Key, count = group.Count() })
+            .ToArrayAsync(cancellationToken);
+        var expiredPending = await dbContext.PlatformApprovalRequests.AsNoTracking()
+            .CountAsync(item => item.Status == PlatformApprovalRequestStatus.Pending && item.ExpiresAt <= now, cancellationToken);
+        var configurationDrafts = await dbContext.PlatformConfigurationVersions.AsNoTracking()
+            .CountAsync(item => item.Status == PlatformConfigurationVersionStatus.Draft, cancellationToken);
+        var notificationCounts = await dbContext.PlatformNotificationDeliveries.AsNoTracking()
+            .GroupBy(item => item.Status)
+            .Select(group => new { status = group.Key, count = group.Count() })
+            .ToArrayAsync(cancellationToken);
+        return Ok(new { approvals = approvalCounts, expiredPending, configurationDrafts, notifications = notificationCounts, checkedAt = now });
+    }
+
     [HttpGet("jobs")]
     [EndpointSummary("查询全平台后台任务")]
     public async Task<ActionResult<IReadOnlyCollection<BackgroundJobItem>>> Jobs(