[Community][Admin] Member Management Page

[nnoce14]

Implement the member management page enabling admins to view, invite, and manage community members.
Refer to legacy code repository for expected layout, UI, and functionality: owner-community admin section

Domain Layer:

• Extend Member aggregate with management operations
• Implement MemberInvitation value objects
• Add domain events: MemberInvited, MemberActivated, MemberRemoved
• Create member search specifications

Application Services:

• Create MemberManagementService
• Implement invite, activate, deactivate, remove operations
• Add bulk operations support

GraphQL:

• Mutations: inviteMember, removeMember, updateMemberRole, bulkInviteMembers
• Queries: getMembers, getMemberInvitations
• Subscriptions: memberUpdated

UI:

• Create member list page with search/filter
• Build member invitation modal/form
• Implement member detail view
• Add bulk actions UI (select, invite, remove)
• Create member status indicators

Testing:

• Unit tests for member operations
• BDD features for invitation workflow
• Integration tests for member queries/mutations
• E2E tests for member management flows