refactor: cargo fmt across 27 files + behavioral fixes

Behavioral changes:
- postgres_db: reorder default processors (cut first), prevent overwriting completed status
- qdrant_db: fix scroll pagination exit condition (next.is_none())
- job_worker: add idempotency guards for face trace / TKG build; better error logging
- main.rs: add LineWriter for stdout buffering

Remaining diff is cargo fmt reformatting (line wrapping, import ordering).

src/core/pipeline/mod.rs

@@ -33,7 +33,13 @@ pub async fn store_asrx_chunks(db: &PostgresDb, uuid: &str) -> Result<()> {
             "start_frame": segment.start_frame,
             "end_frame": segment.end_frame,
         });
-        pre_chunks.push((segment.start_frame as i64, Some(segment.start_time), data, None, None));
+        pre_chunks.push((
+            segment.start_frame as i64,
+            Some(segment.start_time),
+            data,
+            None,
+            None,
+        ));
         speaker_detections.push((
             segment.speaker_id.clone().unwrap_or_default(),
             segment.start_time,