refactor: remove DLD variant awards (80m, 40m, CW)

Removed the following DLD award variants:
- dld-80m.json
- dld-40m.json
- dld-cw.json

Kept dld-80m-cw.json as it represents a more specific combination.

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

src/backend/services/awards.service.js

@@ -27,9 +27,6 @@ function loadAwardDefinitions() {
       'sat-rs44.json',
       'special-stations.json',
       'dld.json',
-      'dld-80m.json',
-      'dld-40m.json',
-      'dld-cw.json',
       'dld-80m-cw.json',
       '73-on-73.json',
     ];