Add VITE_APP_VERSION environment variable and integrate versioning into the application

- Introduced VITE_APP_VERSION in Dockerfile and GitHub workflows to capture the version from Git tags.
- Updated vite.config.ts to define a global constant for the app version.
- Enhanced Layout component to display the app version in the footer for admin pages.
- Added logic to conditionally render the LanguageSwitcher based on active promotions.

.github/workflows/docker.yml

@@ -62,3 +62,4 @@ jobs:
             VITE_TELEGRAM_BOT_USERNAME=
             VITE_APP_NAME=Cabinet
             VITE_APP_LOGO=V
+            VITE_APP_VERSION=${{ github.ref_name }}