fix: clear stale PipelineProgress when new job starts

When a file is re-registered, the old PipelineProgress in Redis
was not cleared, causing the Portal to show 'completed' status
even though the new job was still running.

Now PipelineProgress is deleted when a new job starts processing.

src/worker/job_worker.rs

@@ -312,6 +312,12 @@ impl JobWorker {
             .init_processing_status(&job.uuid, processor_names.clone(), total_frames)
             .await?;
 
+        // Clear any stale PipelineProgress from previous jobs
+        let progress_key = format!("{}progress:{}:pipeline", crate::core::config::REDIS_KEY_PREFIX.as_str(), job.uuid);
+        if let Ok(mut conn) = self.redis.get_conn().await {
+            let _: Option<String> = redis::cmd("DEL").arg(&progress_key).query_async(&mut conn).await.ok();
+        }
+
         self.db
             .update_job_status(job.id, MonitorJobStatus::Running)
             .await?;