Add relayinfo package and utility modules for NIP-11 support

Introduce the `relayinfo` package with `NIP-11` utilities, including `Fees`, `Limits`, and `NIPs` structures. Add utility modules for handling numbers, timestamps, and kinds. Integrate functionality for fetching and managing relay information.

app/main.go

@@ -2,6 +2,8 @@ package app
 
 import (
 	"context"
+	"fmt"
+	"net/http"
 
 	"lol.mleku.dev/log"
 	"next.orly.dev/app/config"
@@ -17,7 +19,12 @@ func Run(ctx context.Context, cfg *config.C) (quit chan struct{}) {
 		}
 	}()
 	// start listener
-
+	l := &Listener{
+		Config: cfg,
+	}
+	addr := fmt.Sprintf("%s:%d", cfg.Listen, cfg.Port)
+	log.I.F("starting listener on %s", addr)
+	go http.ListenAndServe(addr, l)
 	quit = make(chan struct{})
 	return
 }