Add Dockerfiles for main and fallback configurations

Dockerfile

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+# Base image: AKTools official Docker image
+FROM registry.cn-shanghai.aliyuncs.com/akfamily/aktools:1.8.95
+
+# Hugging Face Spaces injects PORT env var (default 7860)
+ENV PORT=7860
+
+# Expose the port for documentation
+EXPOSE 7860
+
+# Start aktools binding to 0.0.0.0 and the PORT env variable
+CMD ["sh", "-c", "python -m aktools --host 0.0.0.0 --port ${PORT}"]

Dockerfile.fallback

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+# Fallback Dockerfile: Build from scratch if China registry is unreachable
+FROM python:3.10-slim
+
+# Install aktools
+RUN pip install --no-cache-dir aktools==1.8.95
+
+# Hugging Face Spaces injects PORT env var (default 7860)
+ENV PORT=7860
+
+# Expose the port for documentation
+EXPOSE 7860
+
+# Start aktools binding to 0.0.0.0 and the PORT env variable
+CMD ["sh", "-c", "python -m aktools --host 0.0.0.0 --port ${PORT}"]