feat(admin): implement member management page with stats and actions (fixes #657)

[naheel0]

This pull request introduces a complete admin dashboard for managing members, including listing, filtering, searching, stats, actions (promote, demote, suspend, activate), and pagination. The changes add new React components, hooks, and types to support these features, as well as backend integration for member actions and stats.

Admin dashboard features:

• Added a new AdminMembersPage with search, filter, stats, and member table UI for managing users and roles.
• Created MemberStats, MembersTable, and TablePagination components to display member statistics, list members with actions, and handle pagination. [1] [2] [3]

Member actions and modals:

• Implemented MemberActionButtons and ActionConfirmationModal components to handle member actions (promote, demote, suspend, activate) with confirmation dialogs and accessibility features. [1] [2]

React Query hooks and types:

• Added React Query hooks for fetching member stats and lists, including backend mapping and query key management. [1] [2]
• Introduced mutation hooks for member actions, with automatic cache invalidation.
• Defined new member-related TypeScript types to standardize data structures.

Dependency updates:

• Minor update to package-lock.json removing unnecessary peer fields for certain dependencies. [1] [2]

Closes #657

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