Unblock device status callback with threaded authentication

[Copilot]

btrMgr_IncomingConnectionAuthentication blocks the device status callback for up to 20 seconds polling for UI response. This delays processing of subsequent device events.

Changes

Threading infrastructure

• Added thread context structure btrMgr_AuthThreadContext_t to safely pass device status info
• Implemented btrMgr_IncomingConnectionAuthenticationAsync() spawning detached pthread
• Thread handles authentication and cleanup, disconnects device on auth failure

Updated call sites
Replaced synchronous calls in btrMgr_DeviceStatusCb with async version at:

• AUTO_CONNECT_ENABLED path for LE HID gamepads (Lost/Paired → Connected)
• Disconnected → Connected transition
• Connecting → Connected transition

Kept synchronous call in BTRMGR_ConnectGamepads_StartUp (initialization context, not a callback).

Example

Before:

int auth = 0;
btrMgr_IncomingConnectionAuthentication(p_StatusCB, &auth);
if (!auth)
    break;
// Callback blocked for up to 20s

After:

btrMgr_IncomingConnectionAuthenticationAsync(p_StatusCB);
// Callback returns immediately, auth happens in background thread
break;

Deliverable

Patch file: btrMgr_IncomingConnectionAuthentication_threading.patch

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