Switch Frigate detector from CPU/TFLite to ONNX with YOLO-NAS-s

Uses YOLO-NAS-s model exported at 320x320 resolution, stored on NFS
at /media/frigate/models/yolo_nas_s.onnx. Significantly better
detection accuracy than the default SSD MobileNet V1.

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

argocd/manifests/frigate/configmap.yaml

@@ -39,8 +39,17 @@ data:
           track: [person, car, dog, cat, bird]
 
     detectors:
-      cpu:
-        type: cpu
+      onnx:
+        type: onnx
+
+    model:
+      model_type: yolonas
+      width: 320
+      height: 320
+      input_tensor: nchw
+      input_pixel_format: bgr
+      path: /media/frigate/models/yolo_nas_s.onnx
+      labelmap_path: /labelmap/coco-80.txt
 
     record:
       enabled: true