feat: implement tag filtering with include/exclude states

- Update frontend tag filter to cycle through include/exclude/clear states
- Add backend support for tag_include and tag_exclude query parameters
- Maintain backward compatibility with legacy tag parameter
- Store tag states as dictionary with 'include'/'exclude' values
- Update test matrix documentation to reflect new tag behavior

The changes enable more granular tag filtering where users can now explicitly include or exclude specific tags, rather than just adding tags to a simple inclusion list. This provides better control over search results and improves the filtering user experience.

py/services/model_query.py

@@ -28,7 +28,7 @@ class FilterCriteria:
 
     folder: Optional[str] = None
     base_models: Optional[Sequence[str]] = None
-    tags: Optional[Sequence[str]] = None
+    tags: Optional[Dict[str, str]] = None
     favorites_only: bool = False
     search_options: Optional[Dict[str, Any]] = None
 
@@ -108,12 +108,30 @@ class ModelFilterSet:
             base_model_set = set(base_models)
             items = [item for item in items if item.get("base_model") in base_model_set]
 
-        tags = criteria.tags or []
-        if tags:
-            tag_set = set(tags)
+        tag_filters = criteria.tags or {}
+        include_tags = set()
+        exclude_tags = set()
+        if isinstance(tag_filters, dict):
+            for tag, state in tag_filters.items():
+                if not tag:
+                    continue
+                if state == "exclude":
+                    exclude_tags.add(tag)
+                else:
+                    include_tags.add(tag)
+        else:
+            include_tags = {tag for tag in tag_filters if tag}
+
+        if include_tags:
             items = [
                 item for item in items
-                if any(tag in tag_set for tag in item.get("tags", []))
+                if any(tag in include_tags for tag in (item.get("tags", []) or []))
+            ]
+
+        if exclude_tags:
+            items = [
+                item for item in items
+                if not any(tag in exclude_tags for tag in (item.get("tags", []) or []))
             ]
 
         return items