Add fall detection and fix access modifiers

- Added Y-coordinate fall detection (spawn.Y - 30)
- Players now respawn when falling below threshold
- Fixed fall() access modifier (protected -> public)
- Added debug logging for locale loading issues

src/main/java/dev/loki/loparkour/mode/CoopMode.java

@@ -163,7 +163,7 @@ public class CoopMode implements MultiMode {
         }
 
         @Override
-        protected void fall() {
+        public void fall() {
             // Show each player their individual contribution before reset
             getPlayers().forEach(pp -> {
                 int contrib = contributions.getOrDefault(pp.getUUID(), 0);