feat: add Lingma OpenAI-compatible gateway service

Dockerfile

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+FROM mcr.microsoft.com/playwright/python:v1.52.0-jammy
+
+WORKDIR /app
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY app /app/app
+
+EXPOSE 8317
+
+CMD ["sh", "-c", "uvicorn app.main:app --host ${HOST:-0.0.0.0} --port ${PORT:-8317}"]