refactoring, adding cli to edit config

cmd/server/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"downloadhub/cmd/server/api"
+	"downloadhub/pkg/data"
+	"flag"
+	"fmt"
+	"log/slog"
+)
+
+func main() {
+	var configFile string
+	var port int
+	flag.StringVar(&configFile, "c", "config.json", "configuration file path")
+	flag.IntVar(&port, "p", 3000, "port of the server")
+	flag.Parse()
+
+	slog.Info("loading configuration...")
+	d := data.Load(configFile)
+	slog.Info("configuration loaded!")
+
+	slog.Info(fmt.Sprintf("starting server on :%d", port))
+	s := api.New(uint16(port), d)
+	err := s.Serve()
+	if err != nil {
+		panic(err)
+	}
+}