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

backend/backend_domains/main.py

@@ -0,0 +1,27 @@
+# backend/main.py
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from backend.backend_domains.router_v1 import router
+from backend.backend_domains.llms import llm_chat_ws_endpoint_v1
+
+
+app = FastAPI(
+    title="Fitz Backend",
+    description="API para interacción con el frontend y ejecución de tareas",
+    version="0.1.0"
+)
+
+# Configuración de CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173", "http://0.0.0.0:5173"],  # Solo permite tu frontend local
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+# Incluye las rutas de tu API
+app.include_router(router, prefix="/api/v1", tags=["v1"])
+app.include_router(llm_chat_ws_endpoint_v1.router)