feat(reviews): add not-applicable count display in evaluation statistics

- Add notApplicable field to Statistics interface
- Show blue "未涉及" badge when count > 0 (display only, no filter)
- Map backend not_applicable_count to frontend statistics

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/routes/reviews.tsx

@@ -72,6 +72,7 @@ interface Statistics {
   success: number;
   warning: number;
   error: number;
+  notApplicable: number;
   score: number;
 }
 
@@ -239,6 +240,7 @@ export async function loader({ request }: LoaderFunctionArgs) {
           success: unifiedData.summary?.passed_count || 0,
           error: unifiedData.summary?.failed_count || 0,
           warning: 0,
+          notApplicable: unifiedData.summary?.not_applicable_count || 0,
           score: unifiedData.summary?.total_score || 0
         },
         comparison_document: ('comparison_document' in reviewData && !('error' in reviewData)) ? reviewData.comparison_document : null,