Enhance Bluetooth functionality and GUI integration

- Add Bluetooth device list management with discovery and pairing support
- Implement volume control with AVRC integration
- Add system event handling for GUI-to-Bluetooth communication
- Enhance menu system with device selection and volume control pages
- Improve memory management by making menu creation lazy
- Add proper event subscription between GUI and Bluetooth modules
- Update filter coefficient for improved audio clicking behavior

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

sdkconfig.defaults

@@ -1,4 +1,3 @@
-<<<<<<< HEAD
 # Override some defaults so BT stack is enabled and
 # Classic BT is enabled
 CONFIG_BT_ENABLED=y
@@ -8,14 +7,3 @@ CONFIG_BTDM_CTRL_MODE_BTDM=n
 CONFIG_BT_BLUEDROID_ENABLED=y
 CONFIG_BT_CLASSIC_ENABLED=y
 CONFIG_BT_A2DP_ENABLE=y
-=======
-# Override some defaults so BT stack is enabled and
-# Classic BT is enabled
-CONFIG_BT_ENABLED=y
-CONFIG_BTDM_CTRL_MODE_BLE_ONLY=n
-CONFIG_BTDM_CTRL_MODE_BR_EDR_ONLY=y
-CONFIG_BTDM_CTRL_MODE_BTDM=n
-CONFIG_BT_BLUEDROID_ENABLED=y
-CONFIG_BT_CLASSIC_ENABLED=y
-CONFIG_BT_A2DP_ENABLE=y
->>>>>>> 4feb4c0a98bddb1f2a172ea4b195ce31ba18d442