ios: enable network interception on real devices

The real IOSDevice did not implement NetworkInterceptorProvider, so
'mobilecli network listen --device <ios-udid>' failed with 'network
interception is not supported'. Add IOSDevice.NetworkInterceptor: it ensures the
agent (mapped via the native signing-free loader) and returns the same
agentNetwork RPC relay Android and the simulator use — the agent's dispatcher
routes network.* to MobileNetwork.

Verified end-to-end on iPhone12,1 iOS 26.5.2: 'network listen' maps the agent
(483 rebases, 244 binds, 5 classes, 5 categories), the server binds, and
network.enable/poll/disable round-trip over the forwarded agent port.

Author: mobile-kevin

devices/network.go

@@ -97,3 +97,14 @@ func (s *SimulatorDevice) NetworkInterceptor() (NetworkInterceptable, error) {
 	}
 	return agentNetwork{port: port}, nil
 }
+
+// NetworkInterceptor maps the agent dylib into the foreground app on a real iOS
+// device (signing-free, over the debugserver) and returns a relay to its in-app
+// agent. The agent's dispatcher routes network.* RPC to MobileNetwork.
+func (d *IOSDevice) NetworkInterceptor() (NetworkInterceptable, error) {
+	port, err := d.ensureIOSDeviceAgentReady()
+	if err != nil {
+		return nil, err
+	}
+	return agentNetwork{port: port}, nil
+}