fix: Adjust agent path and add agent initialization log

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

main.py

@@ -24,12 +24,13 @@ ADAPTER_IFACE = 'org.bluez.Adapter1'
 DEVICE_IFACE = 'org.bluez.Device1'
 AGENT_IFACE = 'org.bluez.Agent1'
 AGENT_MANAGER_IFACE = 'org.bluez.AgentManager1'
-AGENT_PATH = '/dev/what/agent'
+AGENT_PATH = '/io/bluetooth_speaker/agent'
 CAPABILITY = 'NoInputNoOutput'
 
 class Agent(ServiceInterface):
     def __init__(self, interface_name):
         super().__init__(interface_name)
+        logging.info('Agent instance created')
 
     @method()
     def Release(self):