Add requires_capture_bus attribute to BaseModule and passive modules

- BaseModule now has requires_capture_bus = False default
- All 17 passive modules set requires_capture_bus = True
- bigbrother.py imports CaptureBus from core.capture_bus
- Ready for Engine to instantiate and inject CaptureBus

modules/passive/host_discovery.py

@@ -640,6 +640,7 @@ class HostDiscovery(BaseModule):
                 break
             parts.append(data[offset:offset + length].decode("utf-8", errors="replace"))
             offset += length
+    requires_capture_bus = True
 
         name = ".".join(parts) if parts else ""
         return (name, saved_offset if jumped else offset)