Fix USB MIDI, add GPIO for switches and LEDs

- Remove TinyUSBDevice.begin() conflict with Arduino core
- Switch stub now reads GPIO with debounce (pins 1-10)
- LED stub now drives GPIO pins (pins 11-20) with startup animation
- All pins printed to console on init

src/midi_transport.cpp

@@ -11,7 +11,7 @@ UsbMidiTransport::~UsbMidiTransport() {
 }
 
 bool UsbMidiTransport::begin() {
-    Serial.println("[MIDI] Initializing USB MIDI...");
+    Serial.println("[MIDI] Setting up USB MIDI device...");
 
     TinyUSBDevice.setManufacturerDescriptor("Ashley Strahle");
     TinyUSBDevice.setProductDescriptor("Loopy Foot Controller");
@@ -22,9 +22,8 @@ bool UsbMidiTransport::begin() {
         return false;
     }
 
-    TinyUSBDevice.begin();
     initialized = true;
-    Serial.println("[MIDI] USB MIDI initialized - waiting for host");
+    Serial.println("[MIDI] USB MIDI ready");
     return true;
 }