refactor: move main.go to root directory

main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"log/slog"
+	"os"
+
+	"github.com/joho/godotenv"
+	"github.com/lmittmann/tint"
+
+	"backend/internal/server"
+	"backend/internal/worker"
+)
+
+func main() {
+	logger := slog.New(tint.NewHandler(os.Stderr, nil))
+	slog.SetDefault(logger)
+
+	err := godotenv.Load()
+	if err != nil {
+		slog.Warn("No .env file was found; using environment variables.", slog.Any("error", err))
+	}
+
+	go worker.StartWorkers()
+	server.NewRouter()
+}