feat: add complex user invitation and management features

- Implemented complex member and invitation schemas using Zod for validation.
- Created new API endpoints for inviting, accepting, revoking, and canceling complex user invitations.
- Developed handlers for managing complex users, including listing, inviting, revoking, and canceling invitations.
- Added frontend components for displaying and managing complex users and invitations.
- Introduced session storage management for pending invitations.
- Integrated Gravatar for user avatars based on email.
- Created database migration for complex invitations table.

apps/backend/src/generated/prisma/internal/prismaNamespaceBrowser.ts

@@ -57,6 +57,7 @@ export const ModelName = {
   Verification: 'Verification',
   Complex: 'Complex',
   ComplexUser: 'ComplexUser',
+  ComplexInvitation: 'ComplexInvitation',
   Sport: 'Sport',
   Court: 'Court',
   CourtAvailability: 'CourtAvailability',
@@ -169,6 +170,21 @@ export const ComplexUserScalarFieldEnum = {
 export type ComplexUserScalarFieldEnum = (typeof ComplexUserScalarFieldEnum)[keyof typeof ComplexUserScalarFieldEnum]
 
 
+export const ComplexInvitationScalarFieldEnum = {
+  id: 'id',
+  complexId: 'complexId',
+  email: 'email',
+  tokenHash: 'tokenHash',
+  expiresAt: 'expiresAt',
+  acceptedAt: 'acceptedAt',
+  revokedAt: 'revokedAt',
+  createdAt: 'createdAt',
+  updatedAt: 'updatedAt'
+} as const
+
+export type ComplexInvitationScalarFieldEnum = (typeof ComplexInvitationScalarFieldEnum)[keyof typeof ComplexInvitationScalarFieldEnum]
+
+
 export const SportScalarFieldEnum = {
   id: 'id',
   name: 'name',