🧹 [chore] Core Architecture and Performance Upgrade

[beginwebdev2002]

• Verify that the backend is already migrated to NestJS and is correctly configured.
• Enable Angular Zoneless change detection in app.config.ts (already present, and zone.js removed).
• Implement Angular Signals across local state.
• Integrate NgOptimizedImage for components that handle images, such as galleries, avatars, and products, to improve performance. Checked template files (gallery-form, user-profile, veil.component, veil-item, veil-modal, list-view, image-popup, clients.component) and successfully replaced src bindings with ngSrc and updated imports.
• Confirm Data Integrity by verifying HttpClient is exclusively used to retrieve real-time data instead of of() or delay().
• Successfully ran frontend E2E and visual tests, and ran backend unit tests with Jest.

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PR created automatically by Jules for task 10045910068727762469 started by @beginwebdev2002

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