Add peer connectivity testing to protocol blocking service

lib/services/protocol_blocking_service.dart

@@ -78,6 +78,10 @@ class ProtocolBlockingService {
       
       if (_scanCount % 100 == 0) {
         print('🔍 Monitoring ${_activePeerIPs.length} active peers: $_activePeerIPs');
+        // Test if we can see ANY traffic from peers
+        if (_scanCount == 100) {
+          await _testPeerConnectivity();
+        }
       }
     } catch (e) {
       print('❌ Error monitoring peer traffic: $e');
@@ -170,6 +174,49 @@ class ProtocolBlockingService {
     }
   }
   
+  static Future<void> _testPeerConnectivity() async {
+    print('🧪 Testing peer connectivity on wg0 interface...');
+    for (final peerIP in _activePeerIPs) {
+      try {
+        // Check if wg0 interface exists and peer can be seen
+        final wgResult = await Process.run('ip', ['addr', 'show', 'wg0']);
+        if (wgResult.exitCode == 0) {
+          print('✅ wg0 interface exists');
+        } else {
+          print('❌ wg0 interface not found');
+          return;
+        }
+        
+        // Test very basic traffic capture from peer
+        final process = await Process.start('timeout', [
+          '3',
+          'tcpdump',
+          '-i', 'wg0',
+          '-c', '1',
+          'host $peerIP',
+        ]);
+        
+        final output = <String>[];
+        await for (final data in process.stdout) {
+          output.add(String.fromCharCodes(data));
+        }
+        
+        final exitCode = await process.exitCode;
+        process.kill();
+        
+        if (exitCode == 0 && output.isNotEmpty) {
+          print('✅ Can see traffic from peer $peerIP on wg0');
+          print('   Sample: ${output.join().trim()}');
+        } else {
+          print('❌ No traffic detected from peer $peerIP on wg0 in 3 seconds');
+          print('   This suggests the peer is inactive or traffic routing issue');
+        }
+      } catch (e) {
+        print('❌ Error testing peer $peerIP connectivity: $e');
+      }
+    }
+  }
+  
   static List<Connection> _parseConnections(String output, String protocol) {
     final connections = <Connection>[];
     final lines = output.split('\n');