Initial Real-ESRGAN API project setup

Dockerfile

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+ARG VARIANT=cpu
+
+# ---- CPU base ----
+FROM python:3.12-slim AS base-cpu
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl libgl1 libglib2.0-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt /tmp/requirements.txt
+COPY requirements-cpu.txt /tmp/requirements-cpu.txt
+RUN pip install --no-cache-dir -r /tmp/requirements.txt -r /tmp/requirements-cpu.txt \
+    && rm /tmp/requirements*.txt
+
+# ---- GPU base (CUDA 12.4) ----
+FROM nvidia/cuda:12.4.1-cudnn-runtime-ubuntu22.04 AS base-gpu
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    software-properties-common \
+    && add-apt-repository ppa:deadsnakes/ppa \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+    python3.12 python3.12-venv python3.12-dev \
+    curl libgl1 libglib2.0-0 \
+    && ln -sf /usr/bin/python3.12 /usr/bin/python3 \
+    && ln -sf /usr/bin/python3 /usr/bin/python \
+    && python3 -m ensurepip --upgrade \
+    && python3 -m pip install --no-cache-dir --upgrade pip \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt /tmp/requirements.txt
+COPY requirements-gpu.txt /tmp/requirements-gpu.txt
+RUN pip install --no-cache-dir -r /tmp/requirements.txt -r /tmp/requirements-gpu.txt \
+    && rm /tmp/requirements*.txt
+
+# ---- Final stage ----
+FROM base-${VARIANT} AS final
+
+WORKDIR /app
+
+# Copy application code
+COPY app/ /app/app/
+
+# Create data directories
+RUN mkdir -p /data/uploads /data/outputs /data/models /data/temp /data/jobs
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+    CMD curl -f http://localhost:8000/api/v1/health || exit 1
+
+# Expose port
+EXPOSE 8000
+
+# Run API
+CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]