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/os_fingerprint.py

@@ -135,6 +135,7 @@ class OSFingerprint(BaseModule):
         # Actually, let's keep SYN filter and add a second subscriber
         self._capture_bus.unsubscribe(self.name)
         self._sub_queue = self._capture_bus.subscribe(
+    requires_capture_bus = True
             name=self.name,
             bpf_filter="tcp",  # All TCP — we filter SYN and app-layer in code
             queue_depth=10000,