clippy: use bollard::models::NetworkConnectRequest (deprecation)

CI's clippy step failed on commit 194d63e because
bollard::network::ConnectNetworkOptions + its ::container field are
deprecated in bollard 0.19. Switch to the OpenAPI-generated
NetworkConnectRequest which the deprecation notice points at.

Behavior unchanged: same POST to /networks/bridge/connect with the
container name as payload.

Also attached bridge to the currently-in-flight research team
container out-of-band so its still-running iteration can complete —
without this the run would time out again like the last one.

crates/cm-api/src/research_container.rs

@@ -273,12 +273,13 @@ pub async fn spawn(
 /// attached" case (repeat spawns / restarts). Logs any real failure
 /// with the container name so a broken network isn't invisible.
 async fn attach_external_bridge(docker: &Docker, name: &str) {
-    use bollard::network::ConnectNetworkOptions;
+    // Use the OpenAPI-generated NetworkConnectRequest — the older
-    let opts: ConnectNetworkOptions<String> = ConnectNetworkOptions {
+    // ConnectNetworkOptions was deprecated in bollard 0.19.
-        container: name.to_string(),
+    let req = bollard::models::NetworkConnectRequest {
+        container: Some(name.to_string()),
         ..Default::default()
     };
-    match docker.connect_network("bridge", opts).await {
+    match docker.connect_network("bridge", req).await {
         Ok(_) => {}
         Err(bollard::errors::Error::DockerResponseServerError {
             status_code: 403, ..