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/sat-rs44.json

@@ -2,6 +2,7 @@
   "id": "sat-rs44",
   "name": "RS-44 Satellite",
   "description": "Work 44 QSOs on satellite RS-44",
+  "caption": "Make 44 unique QSOs via the RS-44 satellite. Each QSO with a different callsign counts toward the total.",
   "category": "custom",
   "rules": {
     "type": "counter",