feat: admin provider routes (list/update/delete/test) with admin middleware

k-tv-backend/api/src/routes/mod.rs

@@ -6,6 +6,7 @@ use crate::state::AppState;
 use axum::Router;
 
 pub mod admin;
+pub mod admin_providers;
 pub mod auth;
 pub mod channels;
 pub mod config;
@@ -17,6 +18,7 @@ pub mod library;
 pub fn api_v1_router() -> Router<AppState> {
     Router::new()
         .nest("/admin", admin::router())
+        .nest("/admin/providers", admin_providers::router())
         .nest("/auth", auth::router())
         .nest("/channels", channels::router())
         .nest("/config", config::router())