Reset variable backend API with dynamic paths

[israelias]

This pull request includes changes to the frontend/src/constants/backend.constants.ts file to improve the configuration and resource management. The most important changes include updating the backend URL configuration and modifying the way static assets are referenced.

Configuration updates:

• Changed the BACKEND_URL to use an environment variable with a fallback to a local server URL.
• Updated the API constant to dynamically use the BACKEND_URL.

Resource management improvements:

• Modified the references to static assets (DEFAULT_AVATAR, DEFAULT_PLACEHOLDER, MOBILE_SPLASHSCREEN, DEFAULT_ICON, DEFAULT_ADAPTIVE_ICON) to use local assets with a fallback to URLs based on the BACKEND_URL.This pull request to frontend/src/constants/backend.constants.ts includes changes to improve the configuration of backend URLs and asset paths. The most important changes include updating the backend URL configuration to be dynamic and replacing hardcoded asset paths with local asset references.

Configuration updates:

• frontend/src/constants/backend.constants.ts: Updated the BACKEND_URL to be dynamic, using an environment variable or a default local URL.

Asset path updates:

• frontend/src/constants/backend.constants.ts: Replaced hardcoded URLs for DEFAULT_AVATAR, DEFAULT_PLACEHOLDER, MOBILE_SPLASHSCREEN, DEFAULT_ICON, and DEFAULT_ADAPTIVE_ICON with local asset references.

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