Update requirements.txt

requirements.txt

@@ -1,12 +1,16 @@
-flask==3.0.3
-flask-cors==4.0.1
-filelock==3.15.4
-chromadb==0.5.5
-fastembed==0.3.4
-sentence-transformers==3.0.1
-huggingface-hub>=0.23.0
-PyMuPDF==1.24.10
-pypdf==4.3.1
-# LLM providers (pick what you need)
-openai>=1.40.0
-together==1.2.0
+# Web app
+flask>=2.3,<3
+flask-cors>=4,<5
+gunicorn>=21,<22
+
+# LLM clients
+openai>=1.0.0
+huggingface_hub>=0.24
+together>=1.2
+
+# Vector store
+chromadb==0.5.*
+
+# Embeddings (primary + fallback)
+fastembed>=0.3.4
+sentence-transformers>=3.0