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/dxcc-cw.json

@@ -2,6 +2,7 @@
   "id": "dxcc-cw",
   "name": "DXCC CW",
   "description": "Confirm 100 DXCC entities using CW mode",
+  "caption": "Contact and confirm 100 different DXCC entities using CW mode only. Only QSOs made with CW mode count toward this award. QSOs are confirmed when LoTW QSL is received.",
   "category": "dxcc",
   "rules": {
     "type": "filtered",