🔧 fix: restore proper cache condition in CI/CD workflow

Restored the correct cache condition that was accidentally removed:
- Only save cache when docs are generated (cache miss)
- Matches the improved main branch version
- Ensures consistent behavior across branches

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

.gitea/workflows/ci-cd.yaml

@@ -175,6 +175,7 @@ jobs:
         run: go generate ./pkg/server
 
       - name: Save Swagger Docs Cache
+        if: steps.cache-swagger-restore.outputs.cache-hit != 'true'
         id: cache-swagger-save
         uses: actions/cache/save@v5
         with: