Fix: Make AuthorizeService async to handle D-Bus rejections; correct CAPABILITY

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -28,7 +28,6 @@ AGENT_IFACE = 'org.bluez.Agent1'
 AGENT_MANAGER_IFACE = 'org.bluez.AgentManager1'
 AGENT_PATH = '/io/bluetooth_speaker/agent'
 CAPABILITY = 'DisplayYesNo'
-CAPABILITY = 'NoInputNoOutput'
 CALLS_SERVICE_UUID = '0000111e-0000-1000-8000-00805f9b34fb'
 AUDIO_SERVICE_UUID = '0000110d-0000-1000-8000-00805f9b34fb'
 
@@ -72,7 +71,7 @@ class Agent(ServiceInterface):
         asyncio.create_task(trust_and_connect_device(device))
 
     @method()
-    def AuthorizeService(self, device: 'o', uuid: 's'):
+    async def AuthorizeService(self, device: 'o', uuid: 's'):
         logging.info(f"AuthorizeService request for device {device} with UUID {uuid}")
         if uuid.lower() == CALLS_SERVICE_UUID:
             logging.warning("Rejecting Hands-Free Profile (HFP) connection.")