feat(actpred): 动作预测模块入库（PyTorch 训练/预测/ONNX 导出）

actpred/.gitignore

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+# Virtual environment
+venv/
+.env/
+
+# Python bytecode
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Checkpoints and trained models
+checkpoints/
+*.pt
+*.pth
+*.onnx
+
+# Dataset (too large for git)
+data/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store