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/lib/helgoboss-learn/src/base/ui_util.rs

@@ -0,0 +1,9 @@
+pub fn format_percentage_without_unit(value: f64) -> String {
+    let percentage = value * 100.0;
+    format!("{percentage:.4}")
+}
+
+pub fn parse_percentage_without_unit(text: &str) -> Result<f64, &'static str> {
+    let percentage: f64 = text.parse().map_err(|_| "not a valid decimal value")?;
+    Ok(percentage / 100.0)
+}