feat: add configurable mode groups to award detail view

Add per-award configurable mode groups for filtering multiple modes
together in the award detail view. Mode groups are displayed with
visual separators in the mode filter dropdown.

Backend changes:
- Add modeGroups to getAllAwards() return mapping
- Add getAwardById() function to fetch single award definition
- Add GET /api/awards/:awardId endpoint

Frontend changes:
- Fetch award definition separately to get modeGroups
- Update availableModes to include mode groups with separator
- Update filteredEntities logic to handle mode groups
- Update groupDataForTable() and applyFilter() for mode groups
- Disable separator option in dropdown

Award definitions:
- DXCC: Add Digi-Modes, Classic Digi-Modes, Mixed-Mode w/o WSJT-Modes,
  Phone-Modes groups
- DLD: Add same mode groups (adjusted for available modes)

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

src/backend/index.js

@@ -40,6 +40,7 @@ import {
 } from './services/job-queue.service.js';
 import {
   getAllAwards,
+  getAwardById,
   getAwardProgressDetails,
   getAwardEntityBreakdown,
 } from './services/awards.service.js';
@@ -913,6 +914,42 @@ const app = new Elysia()
     }
   })
 
+  /**
+   * GET /api/awards/:awardId
+   * Get a single award by ID (requires authentication)
+   */
+  .get('/api/awards/:awardId', async ({ user, params, set }) => {
+    if (!user) {
+      set.status = 401;
+      return { success: false, error: 'Unauthorized' };
+    }
+
+    try {
+      const { awardId } = params;
+      const award = getAwardById(awardId);
+
+      if (!award) {
+        set.status = 404;
+        return {
+          success: false,
+          error: 'Award not found',
+        };
+      }
+
+      return {
+        success: true,
+        award,
+      };
+    } catch (error) {
+      logger.error('Error fetching award', { error: error.message });
+      set.status = 500;
+      return {
+        success: false,
+        error: 'Failed to fetch award',
+      };
+    }
+  })
+
   /**
    * GET /api/awards/:awardId/progress
    * Get award progress for user (requires authentication)