Allow for excluding certain tags from a file search

src/data/mod.rs

@@ -113,6 +113,7 @@ pub struct FilesRequest {
     pub path: String,
     // comma separated numbers
     pub tag_ids: Option<String>,
+    pub exclude_tag_ids: Option<String>,
     pub tag_filter_mode: Option<FilterMode>,
     pub recursive: Option<bool>,
     pub sort: Option<SortType>,