chore: update vercel configuration to use FastAPI framework

vercel.json

@@ -1,21 +1,12 @@
 {
   "$schema": "https://openapi.vercel.sh/vercel.json",
   "version": 2,
-  "builds": [
-    {
-      "src": "main.py",
-      "use": "@vercel/python"
-    }
-  ],
-  "routes": [
-    {
-      "src": "/(.*)",
-      "dest": "main.py"
-    }
-  ],
-  "functions": {
-    "main.py": {
-      "excludeFiles": "{tests/**,docs/**,data/**,logs/**,__pycache__/**,**/*.pyc,**/*.pyo}"
-    }
+  "framework": "fastapi",
+  "env": {
+    "LOG_LEVEL": "INFO",
+    "LOG_FILE_ENABLED": "false",
+    "DATA_DIR": "/tmp/data",
+    "SERVER_STORAGE_TYPE": "local",
+    "SERVER_STORAGE_URL": ""
   }
 }