fix(desktop): DeerFlow UI — ChatArea refactor + ai-elements + dead CSS cleanup

ChatArea retry button uses setInput instead of direct sendToGateway,
fix bootstrap spinner stuck for non-logged-in users,
remove dead CSS (aurora-title/sidebar-open/quick-action-chips),
add ai components (ReasoningBlock/StreamingText/ChatMode/ModelSelector/TaskProgress),
add ClassroomPlayer + ResizableChatLayout + artifact panel

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

crates/zclaw-saas/src/billing/mod.rs

@@ -7,6 +7,7 @@ pub mod payment;
 
 use axum::routing::{get, post};
 
+/// 需要认证的计费路由
 pub fn routes() -> axum::Router<crate::state::AppState> {
     axum::Router::new()
         .route("/api/v1/billing/plans", get(handlers::list_plans))
@@ -16,7 +17,11 @@ pub fn routes() -> axum::Router<crate::state::AppState> {
         .route("/api/v1/billing/usage/increment", post(handlers::increment_usage_dimension))
         .route("/api/v1/billing/payments", post(handlers::create_payment))
         .route("/api/v1/billing/payments/{id}", get(handlers::get_payment_status))
-        // 支付回调（无需 auth）
+}
+
+/// 支付回调路由（无需 auth — 支付宝/微信服务器回调）
+pub fn callback_routes() -> axum::Router<crate::state::AppState> {
+    axum::Router::new()
         .route("/api/v1/billing/callback/{method}", post(handlers::payment_callback))
 }