Update requirements.txt

requirements.txt

@@ -1,13 +1,16 @@
 packaging==24.1
 Flask==3.0.3
 Werkzeug==3.0.4
+flask-cors==4.0.1          # optional but handy if you front this from another origin
+gunicorn==23.0.0           # optional if you use gunicorn on Spaces
 requests==2.32.3
 urllib3==2.2.3
 beautifulsoup4==4.12.3
 lxml==5.3.0
 pdfplumber==0.11.4
+pdfminer.six==20231228     # explicit; pdfplumber depends on it anyway
 python-docx==1.1.2
-docx2pdf==0.1.8
+docx2pdf==0.1.8            # keep if you accept it failing on Linux unless you add a LibreOffice fallback
 openai==1.51.0
 google-api-python-client==2.149.0
 datasets==3.0.1
@@ -16,10 +19,10 @@ huggingface-hub==0.25.2
 rank-bm25==0.2.2
 scikit-learn==1.5.2
 numpy==2.1.2
-torch==2.4.1
+torch==2.4.1               # CPU wheel installs fine on Spaces
 sentence-transformers==3.1.1
 faiss-cpu==1.9.0
 httpx==0.27.2
 transformers==4.45.2
 pillow==10.4.0
-flash-attn==2.6.3
+# flash-attn==2.6.3        # ❌ remove: requires CUDA; will fail to build on Spaces