refactor: 重构项目结构，迁移后端至 mengyastore-backend-go，新增 Java 后端、前端功能更新及部署文档

mengyastore-backend-go/internal/handlers/admin_orders.go

@@ -0,0 +1,35 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (h *AdminHandler) ListAllOrders(c *gin.Context) {
+	if !h.requireAdmin(c) {
+		return
+	}
+	orders, err := h.orderStore.ListAll()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"data": orders})
+}
+
+func (h *AdminHandler) DeleteOrder(c *gin.Context) {
+	if !h.requireAdmin(c) {
+		return
+	}
+	orderID := c.Param("id")
+	if orderID == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "缺少订单 ID"})
+		return
+	}
+	if err := h.orderStore.Delete(orderID); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"data": gin.H{"ok": true}})
+}