feat: 服务器管理前后端字段对齐 — 移除CMDB幽灵字段 + SSH导向表单 + GB→MB内存转换

backend/internal/models/server.go

@@ -144,6 +144,7 @@ type CreateServerRequest struct {
 	CPU         int     `json:"cpu"`
 	Memory      int64   `json:"memory"`
 	Disk        int64   `json:"disk"`
+	Status      string  `json:"status" binding:"omitempty,oneof=running stopped maintenance error"`
 	RegionID    *uint   `json:"region_id"`
 	CloudID     *uint   `json:"cloud_id"`
 	Tags        string  `json:"tags"`