A login's storage is counted, and can have a quota

MediaAttachment.Size was stored and never summed: nobody, the administrator included, could tell what media took,
and nothing bounded it. Counted.Media and MediaOfRoot sum what is kept (not trashed). A login sees what its personas'
uploads and pictures take at /clientapi/user/storage (ViewStorage), with its quota when the server sets one;
Media:QuotaBytesPerRoot (0, no quota, by default) refuses an upload or a picture over it with 422, whichever persona
sends it; the statistics overview gains the media totals, the proxy cache and the trash (ViewMediaTotals). Tests: a
login's storage counts what its personas keep and forgets what is trashed; two uploads from two personas of one login
are refused together past the quota.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub.ClientModels/Admin/ViewStatistics.cs

@@ -12,6 +12,16 @@ namespace PrivaPub.ClientModels.Admin
 		public ViewHostCounts Hosts { get; set; } = new();
 		public int Accounts { get; set; }
 		public ViewLedgerCounts Ledger { get; set; } = new();
+		public ViewMediaTotals Media { get; set; } = new();
+	}
+
+	// what media take on the server: the uploads and pictures kept, the remote media cache, the trash waiting its grace
+	public class ViewMediaTotals
+	{
+		public long MediaBytes { get; set; }
+		public long MediaFiles { get; set; }
+		public long ProxyCacheBytes { get; set; }
+		public long TrashBytes { get; set; }
 	}
 
 	public class ViewLatency