Reorganize top-level directories with clearer naming convention

app -> app-desktop-macos, presets -> app-presets, server -> remote-server,
daw-config-reaper -> osc-config-daw, plugin-reaper-realearn -> plugin-reaper-relearn.
Updated run.py and presets.py path references accordingly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app-desktop-macos/midi_sender.py

@@ -0,0 +1,27 @@
+import rtmidi
+from midi_receiver import midi_receiver
+
+
+MIDI_CH = 0
+TRANSPORT_MIDI_CH = 0
+
+midi_out = rtmidi.MidiOut()
+transport_midi_out = rtmidi.MidiOut()
+
+available_ports = midi_out.get_ports()
+print("Available MIDI ports:", available_ports)
+
+
+def send_cc(cc_number, value, channel=None):
+    ch = (channel - 1) if channel is not None else MIDI_CH
+    msg = [0xB0 | ch, cc_number, value]
+    if midi_out.is_port_open():
+        midi_out.send_message(msg)
+        midi_receiver.midi_out_signal.emit(msg)
+
+
+def send_transport_cc(cc_number, value):
+    msg = [0xB0 | TRANSPORT_MIDI_CH, cc_number, value]
+    if transport_midi_out.is_port_open():
+        transport_midi_out.send_message(msg)
+        midi_receiver.midi_out_signal.emit(msg)