fix: resolve CI failures — RetentionService bean, frontend types, artifact upload

- Remove @ConditionalOnProperty from RetentionService class; guard only @Scheduled method
- Fix QuotaStatus property references in frontend tests
- Downgrade upload-artifact to v3 for Gitea compatibility

.gitea/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
 
       - name: Upload dependency-check report
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: dependency-check-report
           path: target/dependency-check-report.*
@@ -159,7 +159,7 @@ jobs:
 
       - name: Upload Trivy reports
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: trivy-reports
           path: trivy-*.json
@@ -189,7 +189,7 @@ jobs:
 
       - name: Upload Gitleaks report
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: gitleaks-report
           path: gitleaks-report.json