Refactor code structure for improved readability and maintainability

workers/inpaint/Dockerfile

@@ -0,0 +1,26 @@
+# RunPod Serverless worker: SDXL inpainting (Magic Eraser / Generative Fill / Outpaint).
+# CUDA 12.1 base + torch cu121 — the same base the detect/upscale workers use, which
+# runs on RunPod's RTX 3090/4090 (driver 550) hosts (12.1 <= 12.4, backward-compatible).
+# Build context = repo root, so COPY paths are workers/inpaint/*.
+FROM nvidia/cuda:12.1.1-cudnn8-runtime-ubuntu22.04
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        python3 python3-pip git && \
+    ln -sf /usr/bin/python3 /usr/bin/python && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# torch (CUDA 12.1 build) FIRST — carries sm_86 (3090) + sm_89 (4090) kernels.
+RUN pip install --upgrade pip && \
+    pip install torch --index-url https://download.pytorch.org/whl/cu121
+COPY workers/inpaint/requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY workers/inpaint/handler.py .
+
+CMD ["python3", "-u", "handler.py"]