feat: sync live-count, exemplar annotation modules, and update .gitignore

backend/labeling.py

@@ -68,8 +68,13 @@ def label_image(
     threshold: float,
     iou_threshold: float = 0.8,
     min_box_frac: float = 0.0,
+    exemplar_index: int = -1,
+    exemplars: Optional[List[dict]] = None,
 ) -> ImageResult:
-    """Detect every prompt in one image and return the surviving instances."""
+    """Detect every prompt in one image and return the surviving instances.
+
+    When `exemplars` are given, the prompt at `exemplar_index` also carries them
+    as drawn box exemplars (REQ-172); every other prompt runs on text alone."""
     try:
         image = Image.open(image_path).convert("RGB")
     except Exception as exc:  # unreadable/corrupt frame: report, don't abort the job
@@ -77,7 +82,12 @@ def label_image(
 
     width, height = image.size
     try:
-        detections = get_engine().detect(image, prompts, threshold)
+        if exemplars and 0 <= exemplar_index < len(prompts):
+            detections = get_engine().detect_with_exemplars(
+                image, prompts, threshold, exemplar_index, exemplars
+            )
+        else:
+            detections = get_engine().detect(image, prompts, threshold)
     except Exception as exc:
         return ImageResult(image_path, rel_path, width, height, error=str(exc))