Sync Manager

[dmartinol]

Port sync manager

• Copy cmd/thv-operator/pkg/sync to thv-registry-api
• Adapt sync logic to use file-based storage instead of ConfigMap
• Implement retry logic (5-minute interval, unlimited attempts)
• Remove Kubernetes-specific dependencies

Port filtering logic

• Copy cmd/thv-operator/pkg/filtering to thv-registry-api
• Keep filtering interface and implementation unchanged
• Update import paths