add demo model

internal/app/middle/demo.go

@@ -0,0 +1,23 @@
+package middle
+
+import (
+	"net/http"
+	"slices"
+
+	"github.com/gin-gonic/gin"
+)
+
+// 演示模式
+func DemoMiddle() func(c *gin.Context) {
+	return func(ctx *gin.Context) {
+		whiteListUri := []string{
+			"/api/user/login",
+			"/api/log",
+		}
+		if ctx.Request.Method == http.MethodGet || slices.Contains(whiteListUri, ctx.Request.URL.String()) {
+			ctx.Next()
+		} else {
+			ctx.Abort()
+		}
+	}
+}