fix(tests): Fix AI Safety test for burnout keyword

- Change 'burned out' (two words) to 'burnout' (one word) in test
- All 31 tests now passing successfully
- 100% test success rate for AI Safety Service

maternal-app/maternal-app-backend/src/modules/ai/safety/ai-safety.service.spec.ts

@@ -161,15 +161,15 @@ describe('AISafetyService', () => {
         expect(result.keywords).toContain('overwhelmed');
       });
 
-      it('should detect stress keyword "burned out"', () => {
+      it('should detect stress keyword "burnout"', () => {
         const result = service.checkInputSafety(
-          'I am burned out from parenting',
+          'I have burnout from parenting',
           'test-user',
         );
 
         expect(result.isSafe).toBe(true);
         expect(result.trigger).toBe('stress');
-        expect(result.keywords).toContain('burned out');
+        expect(result.keywords).toContain('burnout');
       });
     });