feat: implement DCL ADIF parser and service integration

- Add shared ADIF parser utility (src/backend/utils/adif-parser.js)
  - parseADIF(): Parse ADIF format into QSO records
  - parseDCLResponse(): Parse DCL's JSON response format
  - normalizeBand() and normalizeMode(): Standardize band/mode names

- Implement DCL service (src/backend/services/dcl.service.js)
  - fetchQSOsFromDCL(): Fetch from DCL API (ready for API availability)
  - parseDCLJSONResponse(): Parse example payload format
  - syncQSOs(): Update existing QSOs with DCL confirmations
  - Support DCL-specific fields: DCL_QSL_RCVD, DCL_QSLRDATE, DARC_DOK, MY_DARC_DOK

- Refactor LoTW service to use shared ADIF parser
  - Remove duplicate parseADIF, normalizeBand, normalizeMode functions
  - Import from shared utility for consistency

- Tested with example DCL payload
  - Successfully parses all 6 QSOs
  - Correctly extracts DCL confirmation data
  - Handles ADIF format with <EOR> delimiters

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

CLAUDE.md

@@ -104,3 +104,126 @@ bun --hot ./index.ts
 ```
 
 For more information, read the Bun API docs in `node_modules/bun-types/docs/**.mdx`.
+
+## Project: Quickawards by DJ7NT
+
+Quickawards is a amateur radio award tracking application that calculates progress toward various awards based on QSO (contact) data.
+
+### Award System Architecture
+
+The award system is JSON-driven and located in `award-definitions/` directory. Each award has:
+- `id`: Unique identifier (e.g., "dld", "dxcc")
+- `name`: Display name
+- `description`: Short description
+- `caption`: Detailed explanation
+- `category`: Award category ("dxcc", "darc", etc.)
+- `rules`: Award calculation logic
+
+### Award Rule Types
+
+1. **`entity`**: Count unique entities (DXCC countries, states, grid squares)
+   - `entityType`: What to count ("dxcc", "state", "grid", "callsign")
+   - `target`: Number required for award
+   - `filters`: Optional filters (band, mode, etc.)
+   - `displayField`: Optional field to display
+
+2. **`dok`**: Count unique DOK (DARC Ortsverband Kennung) combinations
+   - `target`: Number required
+   - `confirmationType`: "dcl" (DARC Community Logbook)
+   - Counts unique (DOK, band, mode) combinations
+   - Only DCL-confirmed QSOs count
+
+3. **`points`**: Point-based awards
+   - `stations`: Array of {callsign, points}
+   - `target`: Points required
+   - `countMode`: "perStation", "perBandMode", or "perQso"
+
+4. **`filtered`**: Filtered version of another award
+   - `baseRule`: The base entity rule
+   - `filters`: Additional filters to apply
+
+5. **`counter`**: Count QSOs or callsigns
+
+### Key Files
+
+**Backend Award Service**: `src/backend/services/awards.service.js`
+- `getAllAwards()`: Returns all available award definitions
+- `calculateAwardProgress(userId, award, options)`: Main calculation function
+- `calculateDOKAwardProgress(userId, award, options)`: DOK-specific calculation
+- `calculatePointsAwardProgress(userId, award, options)`: Point-based calculation
+- `getAwardEntityBreakdown(userId, awardId)`: Detailed entity breakdown
+- `getAwardProgressDetails(userId, awardId)`: Progress with details
+
+**Database Schema**: `src/backend/db/schema/index.js`
+- QSO fields include: `darcDok`, `dclQslRstatus`, `dclQslRdate`
+- DOK fields support DLD award tracking
+- DCL confirmation fields separate from LoTW
+
+**Award Definitions**: `award-definitions/*.json`
+- Add new awards by creating JSON definition files
+- Add filename to `loadAwardDefinitions()` file list in awards.service.js
+
+### DLD Award Implementation (COMPLETED)
+
+The DLD (Deutschland Diplom) award was recently implemented:
+
+**Definition**: `award-definitions/dld.json`
+```json
+{
+  "id": "dld",
+  "name": "DLD",
+  "description": "Deutschland Diplom - Confirm 100 unique DOKs on different bands/modes",
+  "caption": "Contact and confirm stations with 100 unique DOKs (DARC Ortsverband Kennung) on different band/mode combinations.",
+  "category": "darc",
+  "rules": {
+    "type": "dok",
+    "target": 100,
+    "confirmationType": "dcl",
+    "displayField": "darcDok"
+  }
+}
+```
+
+**Implementation Details**:
+- Function: `calculateDOKAwardProgress()` in `src/backend/services/awards.service.js` (lines 173-268)
+- Counts unique (DOK, band, mode) combinations
+- Only DCL-confirmed QSOs count (`dclQslRstatus === 'Y'`)
+- Each unique DOK on each unique band/mode counts separately
+- Returns worked, confirmed counts and entity breakdowns
+
+**Database Fields Used**:
+- `darcDok`: DOK identifier (e.g., "F03", "P30", "G20")
+- `band`: Band (e.g., "80m", "40m", "20m")
+- `mode`: Mode (e.g., "CW", "SSB", "FT8")
+- `dclQslRstatus`: DCL confirmation status ('Y' = confirmed)
+- `dclQslRdate`: DCL confirmation date
+
+**Documentation**: See `docs/DOCUMENTATION.md` for complete documentation including DLD award example.
+
+### Adding New Awards
+
+To add a new award:
+
+1. Create JSON definition in `award-definitions/`
+2. Add filename to `loadAwardDefinitions()` in `src/backend/services/awards.service.js`
+3. If new rule type needed, add calculation function
+4. Add type handling in `calculateAwardProgress()` switch statement
+5. Add type handling in `getAwardEntityBreakdown()` if needed
+6. Update documentation in `docs/DOCUMENTATION.md`
+7. Test with sample QSO data
+
+### Confirmation Systems
+
+- **LoTW (Logbook of The World)**: ARRL's confirmation system
+  - Fields: `lotwQslRstatus`, `lotwQslRdate`
+  - Used for DXCC, WAS, VUCC, most awards
+
+- **DCL (DARC Community Logbook)**: DARC's confirmation system
+  - Fields: `dclQslRstatus`, `dclQslRdate`
+  - Required for DLD award
+  - German amateur radio specific
+
+### Recent Commits
+
+- `c982dcd`: feat: implement DLD (Deutschland Diplom) award
+- `322ccaf`: docs: add DLD (Deutschland Diplom) award documentation