feat: Update project structure and configuration files

backend/providers/app/app.go

@@ -0,0 +1,18 @@
+package app
+
+import (
+	"go.ipao.vip/atom/container"
+	"go.ipao.vip/atom/opt"
+)
+
+func Provide(opts ...opt.Option) error {
+	o := opt.New(opts...)
+	var config Config
+	if err := o.UnmarshalConfig(&config); err != nil {
+		return err
+	}
+
+	return container.Container.Provide(func() (*Config, error) {
+		return &config, nil
+	}, o.DiOptions()...)
+}