Implement real, working microservices architecture

backend/services/gateway/main.py

@@ -0,0 +1,10 @@
+from fastapi import FastAPI
+
+# Gateway service - handles complex operations that Caddy cannot
+# This will be expanded later with routing logic to other services
+
+if __name__ == "__main__":
+    app = FastAPI(title="Gateway Service")
+
+    import os, uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=int(os.getenv("PORT", 8301)))