Fix prefix URL routing to handle CIDR notation with slashes

- Use wildcard route pattern for /prefix/* endpoints
- Extract prefix parameter using chi.URLParam(r, "*")
- Fixes 400 error when accessing /prefix/x.x.x.x/32 directly

internal/server/routes.go

@@ -28,7 +28,7 @@ func (s *Server) setupRoutes() {
 
 	// AS and prefix detail pages
 	r.Get("/as/{asn}", s.handleASDetail())
-	r.Get("/prefix/{prefix}", s.handlePrefixDetail())
+	r.Get("/prefix/*", s.handlePrefixDetail())
 	r.Get("/prefixlength/{length}", s.handlePrefixLength())
 	r.Get("/prefixlength6/{length}", s.handlePrefixLength6())
 
@@ -45,7 +45,7 @@ func (s *Server) setupRoutes() {
 		r.Get("/stats", s.handleStats())
 		r.Get("/ip/{ip}", s.handleIPLookup())
 		r.Get("/as/{asn}", s.handleASDetailJSON())
-		r.Get("/prefix/{prefix}", s.handlePrefixDetailJSON())
+		r.Get("/prefix/*", s.handlePrefixDetailJSON())
 	})
 
 	s.router = r