fix: comprehensive fixes for ingestion and TKG

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

src/api/files.rs

@@ -1239,15 +1239,26 @@ async fn unregister(
 
     let deleted_redis_keys = {
         match RedisClient::new() {
-            Ok(redis) => match redis.delete_worker_job(&uuid).await {
-                Ok(_) => {
-                    tracing::info!("[UNREGISTER] Deleted Redis keys for {}", uuid);
-                    Some(1)
+            Ok(redis) => {
+                let mut deleted = 0;
+                
+                // Delete worker job keys
+                if redis.delete_worker_job(&uuid).await.is_ok() {
+                    tracing::info!("[UNREGISTER] Deleted Redis worker job keys for {}", uuid);
+                    deleted += 1;
                 }
-                Err(e) => {
-                    tracing::warn!("[UNREGISTER] Failed to delete Redis keys: {}", e);
-                    None
+                
+                // Delete PipelineProgress key
+                let progress_key = format!("{}progress:{}:pipeline", 
+                    crate::core::config::REDIS_KEY_PREFIX.as_str(), uuid);
+                if let Ok(mut conn) = redis.get_conn().await {
+                    let _: Option<String> = redis::cmd("DEL").arg(&progress_key)
+                        .query_async(&mut conn).await.ok();
+                    tracing::info!("[UNREGISTER] Deleted Redis PipelineProgress for {}", uuid);
+                    deleted += 1;
                 }
+                
+                Some(deleted)
             },
             Err(e) => {
                 tracing::warn!("[UNREGISTER] Failed to create Redis client: {}", e);