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Natalia Portillo cb781ecd57 feat: Add automatic invitation code generation on email confirmation
Implement a new feature where users receive 5 invitation codes when they confirm their email.

Backend changes:
- Extend InvitationCodeGenerator with GenerateForOwnerAsync() for batch code creation
- Mint 5 codes on email confirmation (not registration) in AuthController.ConfirmEmailAsync
- Add GET /invitation-codes/mine (self-service) endpoint for users to view their own codes
- Add POST /users/{id}/invitation-codes (admin-only) endpoint to grant additional codes
- Create MyInvitationCodeDto and GrantInvitationCodesRequest DTOs

Frontend changes:
- Add "My Invitation Codes" tab to Profile.razor with list of user's codes
  - Unused codes rendered normally with copy-to-clipboard button
  - Used codes shown with strikethrough (no user identity revealed)
- Add "Give Invitation Codes" action to admin Users page
  - Dialog prompts for count (1-50) of codes to grant to selected user
  - Success/error messages displayed after granting
- Extend InvitationCodesService.GetMyAsync() and UsersService.GrantInvitationCodesAsync()
- Regenerate Kiota API client from updated OpenAPI schema

No database schema changes required - existing InvitationCode fields accommodate both
registration-issued and admin-granted codes.
2026-06-19 22:28:54 +01:00
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