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>

plugin-reaper-relearn/main/src/domain/realearn_source_context.rs

@@ -0,0 +1,20 @@
+use base::hash_util::NonCryptoHashMap;
+use helgoboss_learn::devices::x_touch::XTouchMackieLcdState;
+use reaper_medium::MidiOutputDeviceId;
+
+/// Global state about sources.
+#[derive(Default)]
+pub struct RealearnSourceState {
+    x_touch_mackie_lcd_state_by_device: NonCryptoHashMap<MidiOutputDeviceId, XTouchMackieLcdState>,
+}
+
+impl RealearnSourceState {
+    pub fn get_x_touch_mackie_lcd_state_mut(
+        &mut self,
+        device: MidiOutputDeviceId,
+    ) -> &mut XTouchMackieLcdState {
+        self.x_touch_mackie_lcd_state_by_device
+            .entry(device)
+            .or_default()
+    }
+}