Update requirements.txt

requirements.txt

@@ -1,12 +1,12 @@
-flask
-flask-cors
-filelock
-pypdf
-chromadb
-sentence-transformers
-fastembed
-huggingface_hub>=0.23
-
-# LLM providers (install all; choose at runtime with LLM_PROVIDER)
-openai>=1.40
-together>=1.2.0
+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