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/was.json

@@ -2,6 +2,7 @@
   "id": "was-mixed",
   "name": "WAS Mixed Mode",
   "description": "Confirm all 50 US states",
+  "caption": "Contact and confirm all 50 US states. Only QSOs with stations located in United States states count toward this award. QSOs are confirmed when LoTW QSL is received.",
   "category": "was",
   "rules": {
     "type": "entity",