refactor(actpred): 模型输入尺寸 image_size → image_width/image_height，默认 1920×1080

config/model/dataset/train/pretrain/predict/export 全链路适配非方形输入，
hailo_infer/onnx_infer 从模型元数据动态推导宽高；旧 224 checkpoint 配置键
不兼容（重训后替换）。Pi 5 CPU 冒烟验证 1080p 训练可行（~4.75s/步 batch=2）。

actpred/predict.py

@@ -31,7 +31,8 @@ class ActionPredictorInference:
         self.frame_len = self._data_cfg.frame_len
 
         self._transform = transforms.Compose([
-            transforms.Resize((self._data_cfg.image_size, self._data_cfg.image_size)),
+            transforms.Resize((self._data_cfg.image_height,
+                               self._data_cfg.image_width)),
             transforms.ToTensor(),
             transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]),
         ])