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.

frontend/src/assets/icons/index.ts

@@ -0,0 +1,18 @@
+// OUTLINED
+export { default as IconArrowLeft } from './outlined/arrow-left.svg?react';
+export { default as IconHomeOutline } from './outlined/home.svg?react';
+export { default as IconUserOutline } from './outlined/user.svg?react';
+export { default as IconCalendarStats } from './outlined/calendar-stats.svg?react';
+export { default as IconDeviceDesktopAnalytics } from './outlined/device-desktop-analytics.svg?react';
+export { default as IconFingerprint } from './outlined/fingerprint.svg?react';
+export { default as IconGauge } from './outlined/gauge.svg?react';
+export { default as IconHome2 } from './outlined/home-2.svg?react';
+export { default as IconSettings } from './outlined/settings.svg?react';
+export { default as IconArrowBarLeft } from './outlined/arrow-bar-left.svg?react';
+export { default as IconArrowBarRight } from './outlined/arrow-bar-right.svg?react';
+export { default as IconCheck } from './outlined/check.svg?react';
+
+
+// FILLED
+export { default as IconHomeFilled } from './filled/home.svg?react';
+export { default as IconUserFilled } from './filled/user.svg?react';