Add award rule captions and configurable point counting modes

- Add caption field to all award definitions with detailed rule explanations
- Rename Special Stations Award to Wavelog Award
- Add configurable countMode for point-based awards:
  - perBandMode: count unique (callsign, band, mode) combinations
  - perStation: count each station once
  - perQso: count every QSO
- Update backend to respect countMode in progress calculation
- Add target field to award API responses
- Fix "Needed" calculation for point-based awards
- Display caption on award detail pages with styled info box

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

award-definitions/vucc-sat.json

@@ -2,6 +2,7 @@
   "id": "vucc-satellite",
   "name": "VUCC Satellite",
   "description": "Confirm 100 unique grid squares via satellite",
+  "caption": "Contact and confirm 100 unique 4-character grid squares via satellite. Only satellite QSOs count. Grid squares are counted as the first 4 characters (e.g., FN31). QSOs are confirmed when LoTW QSL is received.",
   "category": "vucc",
   "rules": {
     "type": "entity",