Swap init order: USB before BLE to avoid PHY interference

BLE radio turning on corrupts USB PHY when TinyUSB initializes after it.
Initialize USB first (stable USB), then BLE radio.

src/main.cpp

@@ -346,13 +346,12 @@ void setup() {
     switch_driver.set_mux(&mux);
     switch_driver.begin();
     
-    Serial.println("[INIT] Initializing BLE MIDI...");
-    delay(1000);
-    ble_midi_transport.begin();
-
-    Serial.println("[INIT] Initializing USB MIDI...");
+    Serial.println("[INIT] Initializing USB MIDI first (before BLE)...");
     midi_transport.begin();
-    delay(500);
+    delay(1000);
+
+    Serial.println("[INIT] Initializing BLE MIDI...");
+    ble_midi_transport.begin();
 
     Serial.println("[INIT] Registering MIDI callbacks...");
     controller.begin();