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/queries.rs

@@ -10,29 +10,3 @@ pub struct SearchItemsQuery {
     pub offset: u32,
     pub limit: u32,
 }
-
-pub struct ListCollectionsQuery {
-    pub provider_id: Option<String>,
-}
-
-pub struct ListShowsQuery {
-    pub provider_id: Option<String>,
-    pub search_term: Option<String>,
-    pub genres: Vec<String>,
-}
-
-pub struct ListSeasonsQuery {
-    pub series_name: String,
-    pub provider_id: Option<String>,
-}
-
-pub struct ListGenresQuery {
-    pub content_type: Option<String>,
-    pub provider_id: Option<String>,
-}
-
-pub struct GetItemQuery {
-    pub item_id: String,
-}
-
-pub struct GetSyncStatusQuery;