Read every route from the routing table in memory (part of #122)

The IP lookups, the AS and prefix pages and their API answers, the prefix-length pages and the stats read routes only from the routing table the prefix handler keeps. fx reads the table at startup and gives it to both. AS names, WHOIS details and first-seen times still come from the database.

The IP lookup names the origin AS most peers carry, with the time of the newest kept route. The prefix answers list peers whose routes are not kept without a path or time. The stats gain origins_without_kept_route. They no longer read route times from the per-peer tables, so the two helpers that did are gone.

Model: opus-5-5

internal/server/server.go

@@ -3,6 +3,10 @@
 //   - the AS, prefix and prefix length pages, and the JSON answers behind them
 //   - the IP lookups
 //   - the AS name search
+//
+// Every route it shows comes from the routing table in memory. AS names,
+// WHOIS details and the times a prefix and an AS were first seen come from
+// the database.
 package server
 
 import (
@@ -19,6 +23,7 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/config"
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/logger"
+	"git.eeqj.de/sneak/routewatch/internal/routetable"
 	"git.eeqj.de/sneak/routewatch/internal/streamer"
 	"github.com/go-chi/chi/v5"
 )
@@ -55,6 +60,7 @@ type dnsResolver interface {
 type Server struct {
 	router     *chi.Mux
 	db         database.Store
+	table      *routetable.Table
 	streamer   *streamer.Streamer
 	logger     *logger.Logger
 	port       int
@@ -71,15 +77,18 @@ type Server struct {
 	resolver dnsResolver
 }
 
-// New creates a new HTTP server
+// New creates a new HTTP server that reads routes from table, the routing
+// table that the prefix handler keeps current.
 func New(
 	db database.Store,
+	table *routetable.Table,
 	streamer *streamer.Streamer,
 	logger *logger.Logger,
 	cfg *config.Config,
 ) *Server {
 	s := &Server{
 		db:             db,
+		table:          table,
 		streamer:       streamer,
 		logger:         logger,
 		port:           cfg.Port,