[codex] android: hide sharee peers from device list

[guanzi008]

What changed

This change hides ShareeNode peers from the normal Android device list.

Why

The control plane can include ShareeNode peers in the netmap for shared-device return-path coordination. These peers are transport-level/internal and are documented to be hidden by default in normal device listings.

The CLI already does this filtering, but the Android grouped peer list did not. As a result, users could see devices that were only present as hidden sharee peers.

Impact

• Shared-device connectivity semantics stay intact.
• Android users no longer see hidden sharee peers as ordinary devices in the peer list.
• This aligns the Android UI with the existing CLI behavior and the ShareeNode contract.

Root cause

PeerHelper grouped every peer from the netmap into the visible device list without excluding Hostinfo.ShareeNode peers.

Validation

• Pulled latest main before applying the change.
• Reviewed parity with the CLI filtering behavior.
• ./gradlew compileDebugKotlin could not be run in this environment because JAVA_HOME is not set and no java binary is available.