feat(backend_server.py): re-add the get_client_data() method

src/judas_server/backend/backend_server.py

@@ -189,7 +189,14 @@ class BackendServer:
             self.server_socket.close()
             self.logger.info("Server has stopped.")
 
-    # def get_client_data(
+    def get_client_data(self, client_id: str) -> dict[str, Any] | None:
-    #     self, client_id: str
+        client: Client | None = self.clients.get(client_id, None)
-    # ) -> dict[str, dict[str, Any]] | None:
+        if client is None:
-    #     return self.clients.get(client_id, None)
+            self.logger.warning(f"Client {client_id} not found")
+            return None
+        return {
+            "id": client.id,
+            "addr": client.addr,
+            "last_seen": client.last_seen,
+            "status": client.status,
+        }