feat: Refactor backend structure by moving main application and router files to backend_domains

backend/backend_domains/main.py

@@ -2,7 +2,7 @@
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from backend.router_v1 import router
+from backend.backend_domains.router_v1 import router
 from backend.backend_domains.llms import llm_chat_ws_endpoint_v1
 
 

main.py

@@ -4,7 +4,7 @@ import asyncio
 import uvicorn
 from entrypoint.init_db import init_db
 
-from backend.main import app as fastapi_app
+from backend.backend_domains.main import app as fastapi_app
 
 async def main_async():
     # Inicia tareas de fondo controladas desde aquí