fix: add pip timeout 600s + retries for Chinese CDN, use Python 3.12 default

Dockerfile

@@ -1,10 +1,5 @@
 # Hugging Face Spaces Dockerfile for PaddleOCR-VL Document Parser API
-# GPU-accelerated document parsing with PaddleOCR-VL-1.5 + PaddlePaddle
-# Build: v5.0.0 - PaddleOCR-VL for high-quality OCR on Nvidia L4/T4
-#
-# NOTE: Run with --shm-size 16g for PaddlePaddle shared memory:
-#   docker build -t hf-docling .
-#   docker run --gpus all --shm-size 16g -p 7860:7860 -e API_TOKEN=test hf-docling
+# v5.0.0 - PaddleOCR-VL-1.5 + Gemini hybrid, L4/T4 GPU
 
 FROM nvidia/cuda:12.6.3-cudnn-runtime-ubuntu24.04
 
@@ -12,19 +7,10 @@ USER root
 
 # Install system dependencies (Python 3.12 is default in Ubuntu 24.04)
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    python3 \
-    python3-pip \
-    python3-venv \
-    python3-dev \
-    fonts-noto-core \
-    fonts-noto-cjk \
-    fontconfig \
-    libgl1 \
-    libglib2.0-0 \
-    poppler-utils \
-    curl \
-    && fc-cache -fv \
-    && rm -rf /var/lib/apt/lists/*
+    python3 python3-pip python3-venv python3-dev \
+    fonts-noto-core fonts-noto-cjk fontconfig \
+    libgl1 libglib2.0-0 poppler-utils curl \
+    && fc-cache -fv && rm -rf /var/lib/apt/lists/*
 
 # Create non-root user for HF Spaces
 RUN useradd -m -u 1000 user
@@ -36,7 +22,9 @@ ENV PYTHONUNBUFFERED=1 \
     HF_HOME=/home/user/.cache/huggingface \
     XDG_CACHE_HOME=/home/user/.cache \
     HOME=/home/user \
-    PATH=/home/user/.local/bin:/usr/local/bin:/usr/bin:$PATH
+    PATH=/home/user/.local/bin:/usr/local/bin:/usr/bin:$PATH \
+    PIP_DEFAULT_TIMEOUT=600 \
+    PIP_RETRIES=5
 
 RUN mkdir -p /home/user/.cache/huggingface /home/user/.cache/paddleocr /home/user/app \
     && chown -R user:user /home/user
@@ -44,12 +32,14 @@ RUN mkdir -p /home/user/.cache/huggingface /home/user/.cache/paddleocr /home/use
 USER user
 WORKDIR /home/user/app
 
+# Install PaddlePaddle GPU from official index (long timeout for Chinese CDN)
+RUN pip install --user --break-system-packages --timeout 600 \
+    paddlepaddle-gpu==3.2.1 \
+    -i https://www.paddlepaddle.org.cn/packages/stable/cu126/
+
 COPY --chown=user:user requirements.txt .
 
-# Install PaddlePaddle GPU then Python deps
-RUN python3 -m pip install --user --upgrade pip --break-system-packages && \
-    python3 -m pip install --user --break-system-packages paddlepaddle-gpu==3.2.1 -i https://www.paddlepaddle.org.cn/packages/stable/cu126/ && \
-    python3 -m pip install --user --break-system-packages -r requirements.txt
+RUN pip install --user --break-system-packages -r requirements.txt
 
 COPY --chown=user:user . .