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/admin/mod.rs

@@ -1,10 +1,6 @@
-pub mod activity_log;
 pub mod commands;
 pub mod deps;
-pub mod get_settings;
-pub mod queries;
 pub mod update_settings;
 
 pub use commands::UpdateSettingsCommand;
 pub use deps::AdminDeps;
-pub use queries::{GetActivityLogQuery, GetSettingsQuery};