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>

src/frontend/static/award-definitions/special-stations.json

@@ -1,11 +1,13 @@
 {
-  "id": "special-stations",
-  "name": "Special Stations Award",
-  "description": "Contact special stations to earn points - reach 50 points to complete",
+  "id": "wavelog-award",
+  "name": "Wavelog Award",
+  "description": "Contact special stations on multiple bands and modes to earn points - reach 50 points to complete",
+  "caption": "Contact special stations to earn points. Points are awarded for each unique band/mode combination confirmed. 10-point stations: DF2ET, DJ7NT, HB9HIL, LA8AJA. 5-point stations: DB4SCW, DG2RON, DG0TM, DO8MKR. Example: Working DF2ET on 20m/SSB and 20m/CW earns 20 points. Same band/mode combinations are only counted once. Only LoTW-confirmed QSOs count.",
   "category": "special",
   "rules": {
     "type": "points",
     "target": 50,
+    "countMode": "perBandMode",
     "stations": [
       { "callsign": "DF2ET", "points": 10 },
       { "callsign": "DJ7NT", "points": 10 },