fix build error

.gitignore

@@ -4,7 +4,7 @@ dist/
 *.db
 *.db-shm
 *.db-wal
-balance-server
+/balance-server
 balance-server.exe
 target/
 __pycache__/

cmd/balance-server/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"context"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"balance-server/internal/config"
+	"balance-server/internal/database"
+	"balance-server/internal/httpapi"
+)
+
+func main() {
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
+	cfg, err := config.Load()
+	if err != nil {
+		logger.Error("configuration error", "error", err)
+		os.Exit(1)
+	}
+	db, err := database.Open(cfg.DatabasePath)
+	if err != nil {
+		logger.Error("database error", "error", err)
+		os.Exit(1)
+	}
+	defer db.Close()
+
+	server := &http.Server{
+		Addr:              cfg.Address,
+		Handler:           httpapi.New(cfg, db, logger),
+		ReadHeaderTimeout: 5 * time.Second,
+		ReadTimeout:       15 * time.Second,
+		WriteTimeout:      30 * time.Second,
+		IdleTimeout:       60 * time.Second,
+	}
+	go func() {
+		logger.Info("Balance server started", "address", cfg.Address, "database", cfg.DatabasePath)
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			logger.Error("server stopped", "error", err)
+			os.Exit(1)
+		}
+	}()
+
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+	<-stop
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := server.Shutdown(ctx); err != nil {
+		logger.Error("graceful shutdown failed", "error", err)
+	}
+}