fix: count QSOs confirmed by either LoTW or DCL in stats

QSO stats were only counting LoTW-confirmed QSOs, excluding
QSOs confirmed only by DCL from the "confirmed" count.

Changed getQSOStats() to count QSOs as confirmed if EITHER
LoTW OR DCL has confirmed them:
- Before: q.lotwQslRstatus === 'Y'
- After: q.lotwQslRstatus === 'Y' || q.dclQslRstatus === 'Y'

Fixes stats showing 8317/8338 confirmed when all QSOs were
confirmed by at least one system.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/services/lotw.service.js

@@ -401,7 +401,7 @@ export async function getUserQSOs(userId, filters = {}, options = {}) {
  */
 export async function getQSOStats(userId) {
   const allQSOs = await db.select().from(qsos).where(eq(qsos.userId, userId));
-  const confirmed = allQSOs.filter((q) => q.lotwQslRstatus === 'Y');
+  const confirmed = allQSOs.filter((q) => q.lotwQslRstatus === 'Y' || q.dclQslRstatus === 'Y');
 
   const uniqueEntities = new Set();
   const uniqueBands = new Set();