WinRT: short service-data advertisement sections panic in scan callback

[qdot]

src/winrtble/peripheral.rs (advertisement service-data parsing, ~L277-289) calls data.split_at(2), split_at(4), split_at(16) on service data sections without checking length.

Failure scenario: any nearby device advertising an AD structure of type 0x16/0x20/0x21 with a payload shorter than the UUID length causes a panic inside the WinRT Received callback. This either aborts at the FFI boundary or poisons the latest_service_data RwLock, after which properties()/Debug panic. Remotely triggerable crash of any scanning app.

Fix direction: skip (and trace-log) sections shorter than the UUID size, e.g. via split_at_checked.