add initial application structure with configuration, logging, and health check endpoints

internal/infra/log/logger.go

@@ -0,0 +1,23 @@
+package log
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+
+	"epic-ent/internal/config"
+)
+
+func NewLogger(cfg *config.Config) (*zap.Logger, error) {
+	level := zapcore.InfoLevel
+	if err := level.Set(cfg.Log.Level); err != nil {
+		level = zapcore.InfoLevel
+	}
+
+	zapCfg := zap.NewProductionConfig()
+	zapCfg.Level = zap.NewAtomicLevelAt(level)
+	if cfg.Log.Format == "console" {
+		zapCfg.Encoding = "console"
+	}
+
+	return zapCfg.Build()
+}