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/tkg/models.rs

@@ -57,15 +57,26 @@ pub struct TkgBuildStats {
 
 impl TkgBuildStats {
     pub fn total_nodes(&self) -> i32 {
-        self.face_track_nodes + self.gaze_track_nodes + self.lip_track_nodes
-            + self.text_region_nodes + self.appearance_trace_nodes + self.accessory_nodes
-            + self.object_nodes + self.hand_nodes + self.speaker_nodes
+        self.face_track_nodes
+            + self.gaze_track_nodes
+            + self.lip_track_nodes
+            + self.text_region_nodes
+            + self.appearance_trace_nodes
+            + self.accessory_nodes
+            + self.object_nodes
+            + self.hand_nodes
+            + self.speaker_nodes
     }
 
     pub fn total_edges(&self) -> i32 {
-        self.co_occurrence_edges + self.speaker_face_edges + self.face_face_edges
-            + self.mutual_gaze_edges + self.lip_sync_edges + self.has_appearance_edges
-            + self.wears_edges + self.hand_object_edges
+        self.co_occurrence_edges
+            + self.speaker_face_edges
+            + self.face_face_edges
+            + self.mutual_gaze_edges
+            + self.lip_sync_edges
+            + self.has_appearance_edges
+            + self.wears_edges
+            + self.hand_object_edges
     }
 
     pub fn to_json(&self) -> serde_json::Value {