feat: add CNB cloud training config (GPU Dockerfile + .cnb.yml + train_cnb.py)

.ide/Dockerfile

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+FROM pytorch/pytorch:2.1.0-cuda12.1-cudnn8-runtime
+
+# 基础工具
+RUN apt-get update && apt-get install -y git curl wget nano && rm -rf /var/lib/apt/lists/*
+
+# tqdm用于进度条
+RUN pip install --no-cache-dir tqdm numpy requests
+
+# 设置工作目录
+WORKDIR /workspace
+
+# 验证CUDA
+RUN python3 -c "import torch; print(f'PyTorch {torch.__version__}, CUDA: {torch.cuda.is_available()}')"