Wifi Rig CTRL

- **Fixed transmitted CW breaking up at the start and intermittently when the CW keyer is used together with Wifi_RIG (RX audio streaming)** - Cause: each CW key event (ON/OFF) was sent only once over UDP. When the Wi-Fi was busy (RX audio stream plus CAT polling at the same time), a lost packet dropped a whole keying element (dit/dah). - Fix: each key packet is now sent redundantly (5 times, ~4 ms apart). The server deduplicates by the packet timestamp, so at least one copy is guaranteed to arrive while the duplicates collapse harmlessly into a single event. - This matches the existing reliability design that already sends the PTT OFF packet 5 times. - The local sidetone was already correct, so its behavior is unchanged.