Add label whitelist to filter detection types

DETECTION_LABELS env var accepts comma-separated list (e.g. "person,cat,dog").
Only matching detections are reported; others are ignored. Empty = report all.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/detector.py

@@ -40,10 +40,12 @@ class ObjectDetector:
         model_path: str,
         labels_path: str,
         confidence_threshold: float = 0.5,
+        label_whitelist: Optional[set[str]] = None,
     ):
         self.model_path = Path(model_path)
         self.labels_path = Path(labels_path)
         self.confidence_threshold = confidence_threshold
+        self.label_whitelist = label_whitelist
 
         self._interpreter = None
         self._input_details = None
@@ -159,6 +161,10 @@ class ObjectDetector:
             class_id = int(class_ids[i])
             label = self._labels[class_id] if class_id < len(self._labels) else f"class_{class_id}"
 
+            # Skip labels not in whitelist (if set)
+            if self.label_whitelist and label not in self.label_whitelist:
+                continue
+
             # Convert from (y_min, x_min, y_max, x_max) to (x_min, y_min, x_max, y_max)
             y_min, x_min, y_max, x_max = boxes[i]
             bbox = (