feat: complete OCI registry implementation with docker push/pull support

A lightweight OCI (Open Container Initiative) registry implementation written in Go.

internal/middleware/cors.go

@@ -0,0 +1,21 @@
+package middleware
+
+import (
+	"github.com/gofiber/fiber/v3"
+)
+
+// CORS 跨域中间件
+func CORS() fiber.Handler {
+	return func(c fiber.Ctx) error {
+		c.Set("Access-Control-Allow-Origin", "*")
+		c.Set("Access-Control-Allow-Credentials", "true")
+		c.Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")
+		c.Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, DELETE, PATCH, HEAD")
+
+		if c.Method() == "OPTIONS" {
+			return c.SendStatus(fiber.StatusNoContent)
+		}
+
+		return c.Next()
+	}
+}