优化结构

internal/biz/system/cache.go

@@ -0,0 +1,15 @@
+package system
+
+import (
+	"context"
+	"time"
+)
+
+// Cache is the shared cache seam. The data implementation uses Redis when it
+// is reachable and falls back to process memory for local development.
+type Cache interface {
+	Get(context.Context, string) (string, bool, error)
+	Set(context.Context, string, string, time.Duration) error
+	Delete(context.Context, string) error
+	Increment(context.Context, string, time.Duration) (int64, error)
+}