collapse 20 pass-through use cases; handlers call ports directly

delete get/list/list_by_owner channels, get_settings/activity_log admin,
get_item/get_sync_status/list_collections/list_seasons/list_shows/list_genres library,
get/list/delete providers, get/list/patch_label config_snapshots,
get_active/list_history/delete_after schedule — all single-delegation.

remove ChannelQueryDeps, LibraryQueryDeps, deleted query/command structs.
add direct port fields to AppState. update MCP crate accordingly.

crates/application/src/library/search.rs

@@ -2,12 +2,12 @@ use domain::DomainResult;
 use domain::models::MediaItem;
 use domain::value_objects::LibrarySearchFilter;
 
-use super::deps::LibraryQueryDeps;
+use super::deps::LibraryCommandDeps;
 use super::parse_content_type;
 use super::queries::SearchItemsQuery;
 
 pub async fn execute(
-    deps: &LibraryQueryDeps,
+    deps: &LibraryCommandDeps,
     query: SearchItemsQuery,
 ) -> DomainResult<(Vec<MediaItem>, u32)> {
     let content_type = query