Fix TypeScript compilation errors in backend

- Fix query parameter type issues (string | string[] to string) in controllers
- Add public getDatabaseAdapter() method to SchemaRepository for db access
- Fix SchemaSyncService export and import issues
- Fix referenceObject vs referenceObjectType property name
- Add missing jiraAssetsClient import in normalizedCacheStore
- Fix duplicate properties in object literals
- Add type annotations for implicit any types
- Fix type predicate issues with generics
- Fix method calls (getEnabledObjectTypes, syncAllSchemas)
- Fix type mismatches (ObjectTypeRecord vs expected types)
- Fix Buffer type issue in biaMatchingService
- Export SchemaSyncService class for ServiceFactory

backend/src/routes/schema.ts

@@ -98,7 +98,6 @@ router.post('/discover', requirePermission('manage_settings'), async (req, res)
     schemaCacheService.invalidate(); // Invalidate cache
     
     res.json({ 
-      success: result.success, 
       message: 'Schema synchronization completed',
       ...result,
     });