feat: Integrate admin module with new backend and fix admin flow issues

[MohamedAmrSafwat]

Summary

This PR integrates the admin module with the new backend and resolves a set of admin-side issues across authentication, analytics, reports, and user management.

What Changed

• Connected admin authentication to the backend login flow.
• Wired admin analytics, reports, and banned users pages to backend-powered data.
• Updated admin API service/contracts/types to match backend responses.
• Fixed admin report status handling and moderation actions.
• Corrected admin dashboard/report counts and related UI behavior.
• Improved admin auth token handling so admin requests use the correct session context.

Fixes Included

• Fixed admin login/session issues that caused redirects back to the login page.
• Fixed report status flows for dismiss, resolve, and moderation actions.
• Fixed report totals/resolved counts to better reflect backend state.
• Fixed admin user management integration with banned users endpoints.
• Added/updated tests covering admin services, hooks, types, and dashboard flows.

Scope

This PR is focused on the admin module and its backend integration.