1. Add Redis PipelineProgress cleanup in unregister_internal
- Deletes progress key when file is unregistered
2. Fix ingestion_complete asr_status query
- Query ASRX first, then ASR
- Filter out NULL values to avoid false negatives
3. Fix TKG 0 nodes/edges support
- TKG is considered done if face traces are complete
- TKG may create 0 nodes/edges for videos with minimal content
4. Add ASRX fallback to ASR segments
- When ASRX has 0 segments but ASR has segments, use ASR segments
- Ensures at least one ASRX output when ASR has content
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