Simplify requirements.txt and Dockerfile: install PyTorch separately

Dockerfile

@@ -21,9 +21,13 @@ RUN apt-get update && apt-get install -y \
 COPY requirements.txt .
 
 # Install Python dependencies
-# Note: --extra-index-url in requirements.txt requires pip>=21.2
-RUN pip install --no-cache-dir --upgrade pip && \
-    pip install --no-cache-dir -r requirements.txt
+# Install PyTorch CPU version first (requires special index)
+RUN pip install --no-cache-dir --upgrade pip setuptools wheel && \
+    pip install --no-cache-dir --extra-index-url https://download.pytorch.org/whl/cpu \
+    torch==2.5.1+cpu torchvision==0.20.1+cpu
+
+# Install remaining dependencies
+RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application files
 COPY . .

requirements.txt

@@ -1,27 +1,13 @@
-# Core PDF & Document Processing
 doclayout-yolo==0.0.4
 pymupdf==1.26.6
 pymupdf-layout==0.0.15
 pymupdf4llm==0.1.9
 pypdfium2==5.0.0
-
-# Deep Learning (CPU-optimized)
---extra-index-url https://download.pytorch.org/whl/cpu
-torch==2.5.1+cpu
-torchvision==0.20.1+cpu
-
-# Image Processing
 pillow==12.0.0
 opencv-python-headless==4.10.0.84
-
-# OCR
 pytesseract==0.3.13
-
-# Utilities
 huggingface-hub==0.26.2
 loguru==0.7.3
 numpy==1.26.4
-
-# Web Framework
 flask==3.0.0
 werkzeug==3.0.1