feat: add filter support for DOK awards

The DOK award type (used for DLD award) now supports filtering by band,
mode, and other QSO fields. This allows creating award variants like:
- DLD on specific bands (80m, 40m, etc.)
- DLD on specific modes (CW, SSB, etc.)
- DLD with combined filters (e.g., 80m + CW)

Changes:
- Modified calculateDOKAwardProgress() to apply filters before processing
- Added example awards: dld-80m, dld-40m, dld-cw, dld-80m-cw
- Filter system uses existing applyFilters() function

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

award-definitions/dld-40m.json

@@ -0,0 +1,19 @@
+{
+  "id": "dld-40m",
+  "name": "DLD 40m",
+  "description": "Confirm 100 unique DOKs on 40m",
+  "caption": "Contact and confirm stations with 100 unique DOKs (DARC Ortsverband Kennung) on the 40m band. Only DCL-confirmed QSOs with valid DOK information on 40m count toward this award.",
+  "category": "darc",
+  "rules": {
+    "type": "dok",
+    "target": 100,
+    "confirmationType": "dcl",
+    "displayField": "darcDok",
+    "filters": {
+      "operator": "AND",
+      "filters": [
+        { "field": "band", "operator": "eq", "value": "40m" }
+      ]
+    }
+  }
+}

award-definitions/dld-80m-cw.json

@@ -0,0 +1,20 @@
+{
+  "id": "dld-80m-cw",
+  "name": "DLD 80m CW",
+  "description": "Confirm 100 unique DOKs on 80m using CW",
+  "caption": "Contact and confirm stations with 100 unique DOKs (DARC Ortsverband Kennung) on the 80m band using CW mode. Only DCL-confirmed QSOs with valid DOK information on 80m CW count toward this award.",
+  "category": "darc",
+  "rules": {
+    "type": "dok",
+    "target": 100,
+    "confirmationType": "dcl",
+    "displayField": "darcDok",
+    "filters": {
+      "operator": "AND",
+      "filters": [
+        { "field": "band", "operator": "eq", "value": "80m" },
+        { "field": "mode", "operator": "eq", "value": "CW" }
+      ]
+    }
+  }
+}

award-definitions/dld-80m.json

@@ -0,0 +1,19 @@
+{
+  "id": "dld-80m",
+  "name": "DLD 80m",
+  "description": "Confirm 100 unique DOKs on 80m",
+  "caption": "Contact and confirm stations with 100 unique DOKs (DARC Ortsverband Kennung) on the 80m band. Only DCL-confirmed QSOs with valid DOK information on 80m count toward this award.",
+  "category": "darc",
+  "rules": {
+    "type": "dok",
+    "target": 100,
+    "confirmationType": "dcl",
+    "displayField": "darcDok",
+    "filters": {
+      "operator": "AND",
+      "filters": [
+        { "field": "band", "operator": "eq", "value": "80m" }
+      ]
+    }
+  }
+}

award-definitions/dld-cw.json

@@ -0,0 +1,19 @@
+{
+  "id": "dld-cw",
+  "name": "DLD CW",
+  "description": "Confirm 100 unique DOKs using CW mode",
+  "caption": "Contact and confirm stations with 100 unique DOKs (DARC Ortsverband Kennung) using CW (Morse code). Each unique DOK on CW counts separately. Only DCL-confirmed QSOs with valid DOK information count toward this award.",
+  "category": "darc",
+  "rules": {
+    "type": "dok",
+    "target": 100,
+    "confirmationType": "dcl",
+    "displayField": "darcDok",
+    "filters": {
+      "operator": "AND",
+      "filters": [
+        { "field": "mode", "operator": "eq", "value": "CW" }
+      ]
+    }
+  }
+}

src/backend/services/awards.service.js

@@ -27,6 +27,10 @@ function loadAwardDefinitions() {
       'sat-rs44.json',
       'special-stations.json',
       'dld.json',
+      'dld-80m.json',
+      'dld-40m.json',
+      'dld-cw.json',
+      'dld-80m-cw.json',
     ];
 
     for (const file of files) {
@@ -173,9 +177,9 @@ export async function calculateAwardProgress(userId, award, options = {}) {
 async function calculateDOKAwardProgress(userId, award, options = {}) {
   const { includeDetails = false } = options;
   const { rules } = award;
-  const { target, displayField } = rules;
+  const { target, displayField, filters } = rules;
 
-  logger.debug('Calculating DOK-based award progress', { userId, awardId: award.id, target });
+  logger.debug('Calculating DOK-based award progress', { userId, awardId: award.id, target, hasFilters: !!filters });
 
   // Get all QSOs for user
   const allQSOs = await db
@@ -185,10 +189,17 @@ async function calculateDOKAwardProgress(userId, award, options = {}) {
 
   logger.debug('Total QSOs for user', { count: allQSOs.length });
 
+  // Apply filters if defined
+  let filteredQSOs = allQSOs;
+  if (filters) {
+    filteredQSOs = applyFilters(allQSOs, filters);
+    logger.debug('QSOs after DOK award filters', { count: filteredQSOs.length });
+  }
+
   // Track unique (DOK, band, mode) combinations
   const dokCombinations = new Map(); // Key: "DOK/band/mode" -> detail object
 
-  for (const qso of allQSOs) {
+  for (const qso of filteredQSOs) {
     const dok = qso.darcDok;
     if (!dok) continue; // Skip QSOs without DOK