Update dependencies and implement workspace member invitation features

[Boluwatife-AJB]

This pull request introduces a new invitation system for workspaces, allowing users to invite others via email. The changes span database schema, backend entities, API endpoints, and supporting services and repositories. The main focus is on creating, storing, and managing workspace invitations, including schema migration, API handling, and business logic.

Invitation feature implementation:

• Added a new database migration (m20260614_212029_create_invitation_table) to create the invitation table with fields for workspace ID, email, name, token, status, and timestamps. [1] [2] [3]
• Generated the invitation SeaORM entity (server/src/entities/invitation.rs) and updated entity module exports to include it. [1] [2] [3]
• Implemented the InvitationRepository with methods to create invitations and check for existing ones by email and workspace. [1] [2]

API and service layer:

• Added request/response structs for workspace invitations and implemented the InvitationService to handle invitation logic, including duplicate checks and token generation. [1] [2] [3]
• Created an Axum handler (invite_workspace_member) and route (/workspaces/{workspace_id}/invitations) for inviting workspace members, and integrated these into the main router and state. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

Supporting and dependency changes:

• Updated code generation scripts and dependencies to include the new invitation table and ensure proper random token generation. [1] [2]

These changes collectively enable a robust invitation workflow for workspace collaboration.

This closes #172

[opeolluwa]

Well done! @Boluwatife-AJB, this is still WorkspaceId,