feat: add DXCC SAT award for satellite-only QSOs

Added new award "DXCC SAT" that only counts satellite QSOs (QSOs with
satName field set). This adds a new "satellite_only" key to award
definitions that filters to only include satellite communications.

Award definition:
- ID: dxcc-sat
- Name: DXCC SAT
- Target: 100 DXCC entities
- Only satellite QSOs count

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

award-definitions/dxcc-sat.json

@@ -0,0 +1,14 @@
+{
+  "id": "dxcc-sat",
+  "name": "DXCC SAT",
+  "description": "Confirm 100 DXCC entities via satellite",
+  "caption": "Contact and confirm 100 different DXCC entities using satellite communications. Only satellite QSOs count toward this award. QSOs are confirmed when LoTW QSL is received.",
+  "category": "dxcc",
+  "rules": {
+    "type": "entity",
+    "entityType": "dxcc",
+    "target": 100,
+    "displayField": "entity",
+    "satellite_only": true
+  }
+}