Refactor project structure and implement new features

- Removed unused security module and updated import paths.
- Enhanced OpenAI client with streaming capabilities for chat completions.
- Added new backend API endpoints for health check (ping).
- Established a new FastAPI application with CORS configuration.
- Created a new Appshell component for the frontend with navigation links.
- Integrated SVG icons and improved styling for the Appshell component.
- Implemented memory management for conversation history using PostgreSQL.
- Developed abstract classes for AI agents and models, with OpenAI integration.
- Added encryption utilities for secure data handling.

main.py

@@ -1,11 +1,34 @@
 # main.py
 
+import asyncio
+import uvicorn
 from entrypoint.init_db import init_db
 
+from backend.main import app as fastapi_app
+
+async def main_async():
+    # Inicia tareas de fondo controladas desde aquí
+    print("🔄 Lanzando tareas en segundo plano...")
+    tareas = []
+
+    # Configura y lanza el servidor FastAPI
+    print("🚀 Lanzando servidor FastAPI...")
+    config = uvicorn.Config(app=fastapi_app, host="0.0.0.0", port=8000, reload=True)
+    server = uvicorn.Server(config)
+
+    # Ejecuta servidor (bloqueante)
+    await server.serve()
+
+    # Cancela tareas si se cae el servidor
+    for task in tareas:
+        task.cancel()
 
 def main():
-    # Aquí puedes colocar lógica adicional de arranque si la tienes
+    print("🛠️ Inicializando base de datos...")
     init_db()
 
+    print("✅ Iniciando sistema...")
+    asyncio.run(main_async())
+
 if __name__ == "__main__":
     main()