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.

.gitignore

@@ -12,3 +12,14 @@ wheels/
 # Volume mounts
 data/postgresql/pgdata/*
 pruebas_conceptos/postgres_extensions/pgdata/*
+
+# Local configuration files
+*.env
+config/.env
+
+
+#Icon files
+frontend/src/assets/icons/filled/** */
+frontend/src/assets/icons/outlined/** */
+
+