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/Statistics/StatisticsOptions.cs

@@ -6,6 +6,13 @@
 		public string GeoDirectory { get; set; } = "/var/lib/privapub/geo";
 		public CrawlerOptions Crawler { get; set; } = new();
 		public GeoOptions Geo { get; set; } = new();
+		public CdnOptions Cdn { get; set; } = new();
+	}
+
+	//owner decision (2026-10-04): the server downloads the CDNs' published address ranges daily (CdnUpdater)
+	public class CdnOptions
+	{
+		public bool AutoUpdate { get; set; } = true;
 	}
 
 	//owner decision (2026-10-04): the server keeps its DB-IP Lite databases current by itself