CDN-fronted servers grouped per CDN, and servers through time

A post whose server is behind a CDN has no place of its own: the globe
groups such posts per CDN in labels on a ring above the Arctic, and
hovering one draws its arc to the CDN's group and a ring where the
server was before the CDN. The card's CDN chip names the CDN, its
domain, how PrivaPub found it (published ranges, response headers or
network), the place before the CDN and the CDN's servers week by week
(/api/privapub/v1/cdns/:domain); the author's tooltip lists the server's
changes of place and CDN week by week (/instances/:host/history). Both
are read on the first hover and kept for the session.

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

Models/APIs.cs

@@ -1,4 +1,4 @@
-namespace decePubClient.Models;
+namespace decePubClient.Models;
 
 /// <summary>
 /// Every PrivaPub route the client calls, relative to AppConfiguration.ApiBaseAddress (b2b.next's naming: the HTTP
@@ -59,6 +59,10 @@ public static class APIs
 	public static class PrivaPub
 	{
 		public const string GET_Instances = "api/privapub/v1/instances";
+		public const string GET_Cdns = "api/privapub/v1/cdns";
+
+		public static string GET_M_InstanceHistory(string host) => $"api/privapub/v1/instances/{Uri.EscapeDataString(host)}/history";
+		public static string GET_M_Cdn(string key) => $"api/privapub/v1/cdns/{Uri.EscapeDataString(key)}";
 
 		public static string GET_M_Provenance(string statusId) => $"api/privapub/v1/statuses/{Uri.EscapeDataString(statusId)}/provenance";
 	}