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/frontend/src/lib/api/resources/complexes.ts

@@ -1,8 +1,15 @@
 import type {
+  AcceptComplexInvitationsInput,
+  AcceptComplexInvitationsResponse,
+  CancelComplexInvitationResponse,
   Complex,
+  ComplexUsersOverview,
   ComplexWithRole,
   CreateComplexPayload,
   CreateComplexResponse,
+  InviteComplexUserInput,
+  InviteComplexUserResponse,
+  RevokeComplexUserInput,
   SelectComplexInput,
   UpdateComplexPayload,
   UpdateComplexResponse,
@@ -49,3 +56,47 @@ export async function select(payload: SelectComplexInput) {
   );
   return response.data;
 }
+
+export async function listUsers(id: string) {
+  const response = await http.get<ComplexUsersOverview>(`/api/complexes/${id}/users`);
+  return response.data;
+}
+
+export async function inviteUser(id: string, payload: InviteComplexUserInput) {
+  const response = await http.post<InviteComplexUserResponse>(
+    `/api/complexes/${id}/users`,
+    JSON.stringify(payload),
+    { headers: { 'Content-Type': 'application/json' } }
+  );
+  return response.data;
+}
+
+export async function revokeUser(id: string, payload: RevokeComplexUserInput) {
+  const response = await http.delete<{ ok: boolean }>(
+    `/api/complexes/${id}/users/${payload.userId}`
+  );
+  return response.data;
+}
+
+export async function acceptPendingInvitations(payload: AcceptComplexInvitationsInput = {}) {
+  const response = await http.post<AcceptComplexInvitationsResponse>(
+    '/api/complexes/accept-pending',
+    JSON.stringify(payload),
+    { headers: { 'Content-Type': 'application/json' } }
+  );
+  return response.data;
+}
+
+export async function resendInvitation(id: string, invitationId: string) {
+  const response = await http.post<InviteComplexUserResponse>(
+    `/api/complexes/${id}/invitations/${invitationId}/resend`
+  );
+  return response.data;
+}
+
+export async function cancelInvitation(id: string, invitationId: string) {
+  const response = await http.delete<CancelComplexInvitationResponse>(
+    `/api/complexes/${id}/invitations/${invitationId}`
+  );
+  return response.data;
+}