chore: dockerfile backend et dépendances python

backend/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpq-dev gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

backend/pytest.ini

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+[pytest]
+asyncio_mode = auto
+testpaths = tests

backend/requirements.txt

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+fastapi==0.115.5
+uvicorn[standard]==0.32.1
+sqlalchemy[asyncio]==2.0.36
+asyncpg==0.30.0
+alembic==1.14.0
+pydantic-settings==2.6.1
+pillow==11.1.0
+python-multipart==0.0.20
+httpx==0.28.0
+pytest==8.3.4
+pytest-asyncio==0.24.0