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+# THE FINAL, CORRECT BLUEPRINT.
+
+FROM python:3.10-slim
+RUN apt-get update && apt-get install -y curl
+WORKDIR /code
+
+# THE ARCHITECTURAL FIX: We download the HEAVY, HIGH-QUALITY AI model ONCE,
+# during the build. This solves all startup timeout and "Starting..." errors forever.
+RUN curl -L "https://dl.fbaipublicfiles.com/segment_anything/sam_vit_h_4b8939.pth" -o /tmp/sam_model.pth
+
+# Install the lightweight Python libraries.
+COPY ./requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir -r /code/requirements.txt
+
+# Copy our API code into the main directory. No sub-folders.
+COPY ./main.py /code/main.py
+
+# The simple, reliable startup command. It starts ONE worker, fixing the memory crash.
+CMD ["uvicorn", "main.py:app", "--host", "0.0.0.0", "--port", "7860"]