Refactor code structure for improved readability and maintainability

runpod-worker/Dockerfile

@@ -0,0 +1,29 @@
+# RunPod Serverless worker: FLUX.2 [klein] image editing.
+# CUDA 12.4 base + torch cu124: RunPod's RTX 3090/4090 hosts run driver 550
+# (CUDA 12.4). A 12.8 base demands driver >= 12.8 and the container REFUSES to
+# start on a 550 host ("nvidia-container-cli: unsatisfied condition: cuda>=12.8").
+# 12.4 runs on driver 550+ and carries sm_86 (3090) + sm_89 (4090) kernels.
+# NOTE: this does NOT carry Blackwell (sm_120) kernels — keep this endpoint's GPU
+# pool to 3090/4090 (24 GB Ada/Ampere), not the PRO 6000 Blackwell cards.
+FROM nvidia/cuda:12.4.1-cudnn-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 12.4 build) FIRST — matches the 12.4 base + driver 550 hosts.
+RUN pip install --upgrade pip && \
+    pip install torch --index-url https://download.pytorch.org/whl/cu124
+COPY runpod-worker/requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY runpod-worker/handler.py .
+
+CMD ["python3", "-u", "handler.py"]