fix: harden platform runtime and menu navigation

backend/api/internal/middleware/cors.go

@@ -0,0 +1,27 @@
+// Package middleware 定义平台 API 自有的 HTTP 中间件。
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	allowedHeaders = "Origin, Content-Length, Content-Type, Workspace, Request-Id, Authorization, Token"
+	allowedMethods = "GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS"
+)
+
+// Cors 允许平台前端跨域调用 API，包括状态更新使用的 PATCH 方法。
+func Cors() gin.HandlerFunc {
+	return func(ctx *gin.Context) {
+		ctx.Header("Access-Control-Allow-Origin", "*")
+		ctx.Header("Access-Control-Allow-Headers", allowedHeaders)
+		ctx.Header("Access-Control-Allow-Methods", allowedMethods)
+		if ctx.Request.Method == http.MethodOptions {
+			ctx.AbortWithStatus(http.StatusNoContent)
+			return
+		}
+		ctx.Next()
+	}
+}