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
+  }
+}

src/backend/services/awards.service.js

@@ -22,6 +22,7 @@ function loadAwardDefinitions() {
   try {
     const files = [
       'dxcc.json',
+      'dxcc-sat.json',
       'was.json',
       'vucc-sat.json',
       'sat-rs44.json',
@@ -145,6 +146,12 @@ export async function calculateAwardProgress(userId, award, options = {}) {
     logger.debug('QSOs after allowed_bands filter', { count: finalQSOs.length });
   }
 
+  // Apply satellite_only filter if present
+  if (rules.satellite_only) {
+    finalQSOs = finalQSOs.filter(qso => qso.satName);
+    logger.debug('QSOs after satellite_only filter', { count: finalQSOs.length });
+  }
+
   // Calculate worked and confirmed entities
   const workedEntities = new Set();
   const confirmedEntities = new Set();
@@ -723,6 +730,11 @@ export async function getAwardEntityBreakdown(userId, awardId) {
     });
   }
 
+  // Apply satellite_only filter if present
+  if (rules.satellite_only) {
+    finalQSOs = finalQSOs.filter(qso => qso.satName);
+  }
+
   // Group by (entity, band, mode) slot for entity awards
   // This allows showing multiple QSOs per entity on different bands/modes
   const slotMap = new Map(); // Key: "entity/band/mode" -> slot object