add main.py and vercel.json

api/app.py

@@ -34,7 +34,7 @@ async def lifespan(app: FastAPI):
     
     # Start background initialization of heavy components
     try:
-        from background_init import start_background_initialization
+        from core.background_init import start_background_initialization
         logger.info("🚀 Starting background initialization of components...")
         start_background_initialization()
         logger.info("API started successfully (components loading in background)")

main.py

@@ -0,0 +1,6 @@
+"""
+FastAPI entrypoint for Vercel deployment
+"""
+from api.app import app
+
+# Vercel will automatically detect this file and serve the FastAPI app

vercel.json

@@ -0,0 +1,7 @@
+{
+  "functions": {
+    "main.py": {
+      "runtime": "python3.11"
+    }
+  }
+}