docs: document mode groups feature in CLAUDE.md and README.md

Add documentation for the new configurable mode groups feature:
- CLAUDE.md: Add modeGroups to Award Rule Options section
- CLAUDE.md: Update Award Detail View section with mode group info
- CLAUDE.md: Add to Recent Development Work (January 2026)
- README.md: Add GET /api/awards/:awardId endpoint
- README.md: Add new Mode Groups section in Features in Detail

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

CLAUDE.md

@@ -362,6 +362,23 @@ To add a new award:
 - If `true`, only QSOs with `satName` field set are counted
 - Used for DXCC SAT award
 
+**modeGroups**: Define mode groups for filtering in award detail view
+```json
+{
+  "modeGroups": {
+    "Digi-Modes": ["FT8", "FT4", "MFSK", "PSK31", "RTTY", "JT65", "JT9"],
+    "Classic Digi-Modes": ["PSK31", "RTTY", "JT65", "JT9"],
+    "Mixed-Mode w/o WSJT-Modes": ["PSK31", "RTTY", "AM", "SSB", "FM", "CW"],
+    "Phone-Modes": ["AM", "SSB", "FM"]
+  }
+}
+```
+- Optional field at award definition level (not in `rules`)
+- Key is the display name shown in the mode filter dropdown
+- Value is an array of mode strings to include in the group
+- Used to create convenient mode filters that combine multiple modes
+- Awards without `modeGroups` work as before (backward compatible)
+
 **filters**: Additional filtering options
 - `eq`: equals
 - `ne`: not equals
@@ -443,7 +460,10 @@ The QSO page (`src/frontend/src/routes/qsos/+page.svelte`) includes advanced fil
 
 **Key Features**:
 - **Summary Cards**: Show total, confirmed, worked, needed counts for unique entities
-- **Mode Filter**: Filter by specific mode or view "Mixed Mode" (aggregates all modes by band)
+- **Mode Filter**: Filter by specific mode, mode group, or view "Mixed Mode" (aggregates all modes by band)
+  - Awards can define `modeGroups` to create convenient multi-mode filters
+  - Example groups: "Digi-Modes", "Classic Digi-Modes", "Phone-Modes", "Mixed-Mode w/o WSJT-Modes"
+  - Visual separator (`─────`) appears between mode groups and individual modes
 - **Table Columns**: Show bands (or band/mode combinations) as columns
 - **QSO Counts**: Each cell shows count of confirmed QSOs for that (entity, band, mode) slot
 - **Drill-Down**: Click a count to open modal showing all QSOs for that slot
@@ -456,6 +476,8 @@ The QSO page (`src/frontend/src/routes/qsos/+page.svelte`) includes advanced fil
 **Column Sums**: Show unique entity count per column (not QSO counts)
 
 **Backend Changes** (`src/backend/services/awards.service.js`):
+- `getAllAwards()`: Returns award definitions including `modeGroups`
+- `getAwardById(awardId)`: Returns single award definition with `modeGroups`
 - `calculateDOKAwardProgress()`: Groups by (DOK, band, mode) slots, collects QSOs in `qsos` array
 - `calculatePointsAwardProgress()`: Handles all count modes with `qsos` array
 - `getAwardEntityBreakdown()`: Groups by (entity, band, mode) slots
@@ -511,6 +533,10 @@ const params = new URLSearchParams({
 - DXCC restricted to HF bands (160m-10m) only
 - Added DXCC SAT award for satellite-only QSOs
 - Removed redundant award variants (DXCC CW, DLD variants)
+- Added `modeGroups` for configurable multi-mode filters in award detail view
+  - Per-award configuration of mode groups (Digi-Modes, Phone-Modes, etc.)
+  - Visual separator in mode filter dropdown between groups and individual modes
+  - DXCC and DLD awards include: Digi-Modes, Classic Digi-Modes, Mixed-Mode w/o WSJT-Modes, Phone-Modes
 
 **Award Detail View Improvements**:
 - Summary shows unique entity progress instead of QSO counts
@@ -518,6 +544,11 @@ const params = new URLSearchParams({
 - Satellite QSOs grouped under "SAT" column
 - Bands sorted by wavelength instead of alphabetically
 - Mode removed from table headers (visible in filter dropdown)
+- Mode groups allow filtering multiple modes together (e.g., all digital modes)
+
+**Backend API Additions**:
+- Added `GET /api/awards/:awardId` endpoint for fetching single award definition
+- `getAllAwards()` now includes `modeGroups` field
 
 **QSO Management**:
 - Fixed DELETE /api/qsos/all to handle foreign key constraints