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/schedule/commands.rs

@@ -3,8 +3,3 @@ use uuid::Uuid;
 pub struct GenerateScheduleCommand {
     pub channel_id: Uuid,
 }
-
-pub struct DeleteSchedulesAfterCommand {
-    pub channel_id: Uuid,
-    pub target_generation: u32,
-}