feat: implement WearOS support with DataApi, NodeApi, BLE discovery, and notification/media bridge [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]

[waterWang]

Summary

This PR implements WearOS support in microG by replacing the stub implementations of the Wearable API with fully functional code. The existing codebase already had a substantial play-services-wearable module with AIDL interfaces, service implementations, and protocol handling — what was missing was the actual client-side API implementations and the notification/media bridging layer.

What changed

Replaced stubs (were throwing UnsupportedOperationException):

• DataApiImpl.java — All 8 methods now properly delegate to the service via GmsConnector.call(): putDataItem, getDataItem, getDataItems, deleteDataItems, getFdForAsset, addListener, removeListener
• NodeApiImpl.java — All 4 methods implemented: getLocalNode, getConnectedNodes, addListener, removeListener
• MessageApiImpl.java — addListener and removeListener now functional

New services:

• NotificationBridgeService.java — NotificationListenerService that captures Android notifications and forwards them to WearOS devices via the Data Layer API
• MediaControlBridgeService.java — WearableListenerService that monitors active media sessions and syncs metadata/playback state to wearable, handles transport commands from the watch
• WearableBleManager.java — BLE scanning and GATT connection management for WearOS device discovery using Google Wear Service UUID

Modified:

• WearableImpl.java — Integrated BLE manager for device discovery and connection
• AndroidManifest.xml — Added BLE permissions and service registrations

Related

• Issue: [BOUNTY] WearOS Support [$1340] #2843
• Bounty: BountyHub - WearOS Support ($2340+)

LLM Disclosure

This PR was created with assistance from an AI agent. The implementation follows the existing microG service patterns and all changes have been reviewed for correctness.

[waterWang]

Hi, friendly reminder! All CI checks passed on this PR. Could you take a look when you have a moment? Let me know if anything needs to be changed. Thanks!