Fix Vercel runtime error - remove invalid runtime specification

- Remove 'runtime': 'python3.11' that was causing deployment failure
- Let Vercel auto-detect Python runtime for .py files
- Keep memory and maxDuration configurations for performance
- Fix 'Function Runtimes must have a valid version' error

Author: Neil Munoz

vercel.json

@@ -3,8 +3,7 @@
   "functions": {
     "api/index.py": {
       "maxDuration": 30,
-      "memory": 1024,
-      "runtime": "python3.11"
+      "memory": 1024
     }
   },
   "routes": [