fix: loosen dependency versions and revert invalid vercel.json config to allow python 3.14 wheel resolution

requirements.txt

@@ -4,9 +4,9 @@ pydantic-settings==2.1.0
 python-dotenv==1.0.0
 
 # RAG and ML dependencies
-sentence-transformers==2.7.0
-faiss-cpu==1.8.0
-numpy==1.26.4
+sentence-transformers>=2.7.0
+faiss-cpu>=1.8.0
+numpy>=1.26.4
 
 # LLM API clients
 google-generativeai==0.3.2

vercel.json

@@ -4,10 +4,7 @@
   "functions": {
     "api/**/*.py": {
       "runtime": "@vercel/python@3.1.0",
-      "maxDuration": 10,
-      "config": {
-        "pythonVersion": "3.12"
-      }
+      "maxDuration": 10
     }
   }
 }