fix: use qsoId for fetching QSO details in award page modal

The award page was filtering QSOs by callsign/date/band/mode, which
could return the wrong QSO when multiple QSOs with the same callsign
exist on the same band/mode combination.

Changes:
- Backend: Add qsoId field to award entity breakdown responses
- Backend: Add GET /api/qsos/:id endpoint to fetch QSO by ID
- Backend: Implement getQSOById() function in lotw.service.js
- Frontend: Update openQSODetailModal() to fetch by qsoId instead of filtering
- Frontend: Include qsoId in QSO entry objects for modal click handler

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

src/backend/services/awards.service.js

@@ -210,6 +210,7 @@ async function calculateDOKAwardProgress(userId, award, options = {}) {
     // Initialize combination if not exists
     if (!dokCombinations.has(combinationKey)) {
       dokCombinations.set(combinationKey, {
+        qsoId: qso.id,
         entity: dok,
         entityId: null,
         entityName: dok,
@@ -335,6 +336,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
 
       if (!combinationMap.has(combinationKey)) {
         combinationMap.set(combinationKey, {
+          qsoId: qso.id,
           callsign,
           band,
           mode,
@@ -373,6 +375,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
 
       if (!stationMap.has(callsign)) {
         stationMap.set(callsign, {
+          qsoId: qso.id,
           callsign,
           points,
           worked: true,
@@ -410,6 +413,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
       if (qso.lotwQslRstatus === 'Y') {
         totalPoints += points;
         stationDetails.push({
+          qsoId: qso.id,
           callsign,
           points,
           worked: true,
@@ -446,6 +450,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
     const entities = stationDetails.map((detail) => {
       if (countMode === 'perBandMode') {
         return {
+          qsoId: detail.qsoId,
           entity: `${detail.callsign}/${detail.band}/${detail.mode}`,
           entityId: null,
           entityName: `${detail.callsign} (${detail.band}/${detail.mode})`,
@@ -460,6 +465,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
         };
       } else if (countMode === 'perStation') {
         return {
+          qsoId: detail.qsoId,
           entity: detail.callsign,
           entityId: null,
           entityName: detail.callsign,
@@ -474,6 +480,7 @@ async function calculatePointsAwardProgress(userId, award, options = {}) {
         };
       } else {
         return {
+          qsoId: detail.qsoId,
           entity: `${detail.callsign}-${detail.qsoDate}`,
           entityId: null,
           entityName: `${detail.callsign} on ${detail.qsoDate}`,
@@ -673,6 +680,7 @@ export async function getAwardEntityBreakdown(userId, awardId) {
       }
 
       entityMap.set(entity, {
+        qsoId: qso.id,
         entity,
         entityId: qso.entityId,
         entityName: displayName,