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/presentation/src/handlers/admin.rs

@@ -3,7 +3,7 @@ use axum::extract::{Query, State};
 use std::collections::HashMap;
 
 use api_types::{ActivityEventResponse, ActivityLogParams, SettingsResponse};
-use application::admin::{GetActivityLogQuery, UpdateSettingsCommand};
+use application::admin::UpdateSettingsCommand;
 
 use crate::errors::AppError;
 use crate::extractors::AdminUser;
@@ -15,8 +15,7 @@ pub async fn get_settings(
     State(state): State<AppState>,
     AdminUser(_user): AdminUser,
 ) -> Result<Json<SettingsResponse>, AppError> {
-    let pairs =
-        application::admin::get_settings::execute(&state.admin_deps, application::admin::GetSettingsQuery).await?;
+    let pairs = state.settings_repo.get_all().await?;
     let settings: HashMap<String, String> = pairs.into_iter().collect();
     Ok(Json(SettingsResponse { settings }))
 }
@@ -40,10 +39,8 @@ pub async fn get_activity_log(
     AdminUser(_user): AdminUser,
     Query(params): Query<ActivityLogParams>,
 ) -> Result<Json<Vec<ActivityEventResponse>>, AppError> {
-    let query = GetActivityLogQuery {
-        limit: params.limit.unwrap_or(DEFAULT_ACTIVITY_LIMIT),
-    };
-    let events = application::admin::activity_log::execute(&state.admin_deps, query).await?;
+    let limit = params.limit.unwrap_or(DEFAULT_ACTIVITY_LIMIT);
+    let events = state.activity_query.recent(limit).await?;
     Ok(Json(
         events
             .into_iter()