feat(tui): add usage overlay and sidebar for displaying usage statistics and tasks

feat(tui): implement status bar with connection and turn state indicators
feat(tui): create workflow panel for agent status and progress visualization
feat(web): introduce web frontend interface with static file serving
feat(ws): add WebSocket interface for real-time communication and session management

apps/interfaces/api/src/handlers/mod.rs

@@ -0,0 +1,10 @@
+//! API route handler modules.
+//!
+//! Each sub-module corresponds to a resource group and exposes a `router()`
+//! function that returns an `axum::Router` scoped to that resource's prefix.
+
+pub mod auth;
+pub mod chat;
+pub mod conversations;
+pub mod health;
+pub mod sessions;