feat: add system instance info panel (#5716)

* feat: add system instance reporting

* feat: show system instance resources

* fix: update translations for heartbeat messages in Russian and Vietnamese

controller/system_info.go

@@ -0,0 +1,30 @@
+package controller
+
+import (
+	"net/http"
+
+	"github.com/QuantumNous/new-api/common"
+	"github.com/QuantumNous/new-api/model"
+
+	"github.com/gin-gonic/gin"
+)
+
+func ListSystemInstances(c *gin.Context) {
+	instances, err := model.ListSystemInstances()
+	if err != nil {
+		common.ApiError(c, err)
+		return
+	}
+
+	now := common.GetTimestamp()
+	responses := make([]model.SystemInstanceResponse, 0, len(instances))
+	for _, instance := range instances {
+		responses = append(responses, instance.ToResponse(now))
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"success": true,
+		"message": "",
+		"data":    responses,
+	})
+}