Add branding configuration and assets for Sepehr tenant

- Created branding.config.ts to define branding settings including app title, support contact information, and working hours.
- Added brandingAssets.ts to import and export logo and login images for the Sepehr tenant.
- Introduced config.ts to specify application type as POS for the Sepehr tenant.

src/tenants/sepehr/brandingAssets.ts

@@ -0,0 +1,7 @@
+import login from 'src/tenants/tis/assets/images/login.jpg';
+import logo from 'src/tenants/tis/assets/images/logo.png';
+
+export default {
+  logo,
+  login,
+};