Read wpak cfgs from one folder per archive

Files now load from mb.data/wpak/<archive>/<file>, matching MBDATA's
data/wpak layout and the client's Config/Config.wpak naming, so more
archives can sit beside Config/ later. All nine current files are in
wpak/Config/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/parsers/wpak/PowerActionParser.java

@@ -20,7 +20,7 @@ import java.util.HashMap;
 
 public class PowerActionParser {
 
-    private static final String fileName = "PowerActions.cfg";
+    private static final String fileName = "Config/PowerActions.cfg";
 
     public static HashMap<String, PowerActionTemplate> parsePowerActionsFile() {