Refactor code structure for improved readability and maintainability

backend/main.py

@@ -0,0 +1,26 @@
+# backend/main.py
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from livekit import api
+
+app = FastAPI()
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # permite desde cualquier origen
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+@app.get("/token")
+def get_token(room: str, user: str):
+    access = api.AccessToken("devkey", "secret")
+    grants = api.VideoGrants(
+        room_join=True,
+        room=room,
+        can_publish=True,
+        can_subscribe=True,
+    )
+    access.with_identity(user).with_grants(grants)
+    token = access.to_jwt()
+    return {"token": token}