CDNs found by themselves, and servers followed through time

PrivaPub now finds CDNs three ways, best first: the address ranges the
CDNs publish (Cloudflare, Fastly, Amazon CloudFront, Bunny, Gcore,
Imperva), downloaded daily by CdnUpdater and kept in CdnRangeSet; the
CDN's fingerprint in the responses it already gets from a server
(EdgeHintsHandler on the federation client); and the networks that carry
only a CDN. The fixed ASN list is gone; ASNs shared with plain hosting
(AWS, DataPacket) no longer hide a server. A server's Geo records the
CDN, its domain and how it was found, and weekly snapshots now keep the
city and coordinates too.

Servers through time (ServerPlaces): /instances/:host/history lists a
server's weekly snapshots, a CDN-fronted server's geo names the CDN's
domain and where the server was before it (before_cdn), and
/api/privapub/v1/cdns and /cdns/:domain group servers by CDN with week
by week who joined and who left. Owner decisions recorded in ROADMAP.

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

PrivaPub/Infrastructure/Geo/GeoLocator.cs

@@ -1,4 +1,4 @@
-using MaxMind.Db;
+using MaxMind.Db;
 
 using Microsoft.Extensions.Options;
 
@@ -165,23 +165,4 @@ namespace PrivaPub.Infrastructure.Geo
 			_asn?.Dispose();
 		}
 	}
-
-	public static class CdnNetworks
-	{
-		static readonly Dictionary<int, string> Known = new()
-		{
-			[13335] = "Cloudflare",
-			[209242] = "Cloudflare",
-			[54113] = "Fastly",
-			[20940] = "Akamai",
-			[16625] = "Akamai",
-			[16702] = "Akamai",
-			[21342] = "Akamai",
-			[200325] = "Bunny",
-			[60068] = "CDN77",
-			[15133] = "Edgio"
-		};
-
-		public static string Of(int? asn) => asn is { } number && Known.TryGetValue(number, out var name) ? name : default;
-	}
 }