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/infrastructure/src/ipc/server.rs

@@ -0,0 +1,26 @@
+//! IPC server — binds a Unix socket and accepts incoming client connections.
+
+use std::os::unix::net::UnixListener;
+use std::path::Path;
+
+/// A Unix-socket IPC server.
+pub struct IpcServer {
+    listener: UnixListener,
+}
+
+impl IpcServer {
+    pub fn bind_unix(path: &str) -> anyhow::Result<Self> {
+        let p = Path::new(path);
+        if p.exists() {
+            std::fs::remove_file(p)?;
+        }
+
+        let listener = UnixListener::bind(path)?;
+        Ok(Self { listener })
+    }
+
+    pub fn accept(&self) -> anyhow::Result<crate::ipc::conn::Connection> {
+        let (stream, _addr) = self.listener.accept()?;
+        Ok(crate::ipc::conn::Connection::new(stream))
+    }
+}