feat: implement async modpack import with websockets

internal/models/job.go

@@ -0,0 +1,24 @@
+package models
+
+import "time"
+
+// ImportJobStatus определяет возможные статусы задачи импорта
+type ImportJobStatus string
+
+const (
+	JobStatusPending     ImportJobStatus = "pending"
+	JobStatusDownloading ImportJobStatus = "downloading"
+	JobStatusProcessing  ImportJobStatus = "processing"
+	JobStatusCompleted   ImportJobStatus = "completed"
+	JobStatusFailed      ImportJobStatus = "failed"
+)
+
+// ImportJob представляет задачу на импорт модпака
+type ImportJob struct {
+	ID           int             `json:"id"`
+	Status       ImportJobStatus `json:"status"`
+	Progress     int             `json:"progress"` // 0-100
+	ErrorMessage string          `json:"error_message,omitempty"`
+	CreatedAt    time.Time       `json:"created_at"`
+	UpdatedAt    time.Time       `json:"updated_at"`
+}