M10: the admin statistics API

Under /clientapi/admin/statistics, admin only (the root JWT's IsAdmin policy, like the domain
blocks; /api tokens are persona tokens):
- GET overview?days: totals per channel, inbound and outbound outcomes, the delivery
  success rate, delivery latency p50/p95 from the buckets, active and known servers,
  distinct accounts, and the ledger's written/dropped/failed counts;
- GET hosts?days&sort=volume|failures|latency|host&software&page&limit: per server
  traffic, refusals, failures, latency, accounts, software and delivery health;
- GET hosts/{host}?days: the server's description, its daily series and its last 100
  events;
- GET events?host&channel&outcome&reason&before&limit, and GET server?days for the
  ServerDay rows;
- POST rollups/{day} refolds a past day; POST hosts/{host}/describe describes a server
  again.

Days not yet rolled up, today included, are folded live from the events, so the numbers are
current. Answers that may carry locations carry the DB-IP attribution.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ELjqpznMFMNrJoJUj6K5p2

PrivaPub/Middleware/SocialPubConfigurations.cs

@@ -115,6 +115,7 @@ namespace PrivaPub.Middleware
 				.AddHostedService(services => services.GetRequiredService<InteractionLedger>())
 				.AddSingleton<IJobHandler, RollupJob>()
 				.AddSingleton<IGeoLocator, DbIpLocator>()
+				.AddSingleton<Domain.Statistics.StatisticsQueries>()
 				.AddHostedService<StatisticsSchedule>();
 
 		public static IServiceCollection PrivaPubAuthServicesConfiguration(this IServiceCollection service, IConfiguration configuration)