Server locations: no user threshold

The public projection of a server's place showed only the country for
servers reporting fewer than 10 users. The owner never decided that
threshold: every located server now shows its city, coordinates (0.1°)
and network, and a CDN-fronted one still shows only its CDN, since the
address reached is the CDN's edge. Statistics:PublicCityMinUsers is
gone; the ROADMAP decision on server locations, CLAUDE.md and the
/stargazing explainer are corrected.

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

PrivaPub/Infrastructure/Statistics/StatisticsOptions.cs

@@ -4,7 +4,6 @@
 	{
 		public bool Enabled { get; set; } = true;
 		public string GeoDirectory { get; set; } = "/var/lib/privapub/geo";
-		public int PublicCityMinUsers { get; set; } = 10;
 		public CrawlerOptions Crawler { get; set; } = new();
 		public GeoOptions Geo { get; set; } = new();
 	}