feat: add Python app Dockerfile and dependencies

app/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

app/pytest.ini

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+[pytest]
+asyncio_mode = auto

app/requirements.txt

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+fastapi==0.115.5
+uvicorn[standard]==0.32.1
+sqlalchemy[asyncio]==2.0.36
+aiosqlite==0.20.0
+httpx==0.28.0
+pyyaml==6.0.2
+jinja2==3.1.4
+python-multipart==0.0.12
+pytest==8.3.3
+pytest-asyncio==0.24.0
+respx==0.21.1