feat: extract port from .env

cmd/hspguard/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"os"
 
@@ -31,7 +32,12 @@ func main() {
 
 	user.EnsureAdminUser(ctx, repo)
 
-	server := api.NewAPIServer(":3000", repo)
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "3000"
+	}
+
+	server := api.NewAPIServer(fmt.Sprintf(":%s", port), repo)
 	if err := server.Run(); err != nil {
 		log.Fatalln("ERR: Failed to start server:", err)
 	}