fix: add to download

src/server/models/download.py

@@ -10,7 +10,7 @@ from datetime import datetime, timezone
 from enum import Enum
 from typing import List, Optional
 
-from pydantic import BaseModel, Field, HttpUrl
+from pydantic import BaseModel, Field, HttpUrl, field_validator
 
 
 class DownloadStatus(str, Enum):
@@ -167,6 +167,14 @@ class DownloadRequest(BaseModel):
     priority: DownloadPriority = Field(
         DownloadPriority.NORMAL, description="Priority level for queue items"
     )
+    
+    @field_validator('priority', mode='before')
+    @classmethod
+    def normalize_priority(cls, v):
+        """Normalize priority to lowercase for case-insensitive matching."""
+        if isinstance(v, str):
+            return v.lower()
+        return v
 
 
 class DownloadResponse(BaseModel):