feat: normalize tags to lowercase for Windows compatibility, see #637

Convert all tags to lowercase in tag processing logic to prevent case sensitivity issues on Windows filesystems. This ensures consistent tag matching and prevents duplicate tags with different cases from being created.

Changes include:
- TagUpdateService now converts tags to lowercase before comparison
- Utils function converts model tags to lowercase before priority resolution
- Test cases updated to reflect lowercase tag expectations

py/services/tag_update_service.py

@@ -33,7 +33,8 @@ class TagUpdateService:
         tags_added: List[str] = []
         for tag in new_tags:
             if isinstance(tag, str) and tag.strip():
-                normalized = tag.strip()
+                # Convert all tags to lowercase to avoid case sensitivity issues on Windows
+                normalized = tag.strip().lower()
                 if normalized.lower() not in existing_lower:
                     existing_tags.append(normalized)
                     existing_lower.append(normalized.lower())

py/utils/utils.py

@@ -205,7 +205,9 @@ def calculate_relative_path_for_model(model_data: Dict, model_type: str = 'lora'
     base_model_mappings = settings_manager.get('base_model_path_mappings', {})
     mapped_base_model = base_model_mappings.get(base_model, base_model)
 
-    first_tag = settings_manager.resolve_priority_tag_for_model(model_tags, model_type)
+    # Convert all tags to lowercase to avoid case sensitivity issues on Windows
+    lowercase_tags = [tag.lower() for tag in model_tags if isinstance(tag, str)]
+    first_tag = settings_manager.resolve_priority_tag_for_model(lowercase_tags, model_type)
 
     if not first_tag:
         first_tag = 'no tags'  # Default if no tags available