feat(api): GET /api/admin/search endpoint + regenerated client types

Expose full-text search over catalogue objects via a new admin endpoint
backed by the Meilisearch SearchClient. Validates visibility filter values,
short-circuits on empty queries, clamps pagination, and returns 503 when
search is not configured. Registered in OpenAPI; schema.d.ts regenerated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/api/src/lib.rs

@@ -3,6 +3,7 @@
 mod admin;
 mod admin_authorities;
 mod admin_objects;
+mod admin_search;
 mod admin_vocab;
 mod health;
 mod openapi;
@@ -63,6 +64,7 @@ pub fn build_app(state: AppState) -> Router {
         .merge(admin::routes())
         .merge(admin_objects::routes())
         .merge(admin_vocab::routes())
+        .merge(admin_search::routes())
         .merge(admin_authorities::routes())
         .layer(session_layer)
         .with_state(state)