feat: tool 添加 gin local

tool/gin.go

@@ -0,0 +1,12 @@
+package tool
+
+import "github.com/gin-gonic/gin"
+
+func Local(c *gin.Context, key string) any {
+	data, ok := c.Get(key)
+	if !ok {
+		return nil
+	}
+
+	return data
+}