Deprecate legacy login/register methods, update types

- Mark login() and register() as @deprecated (use Better Auth directly)
- Sync types with backend changes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/index.ts

@@ -24,6 +24,8 @@ export type {
   KeyStatus,
   ExportStatus,
   RbacRole,
+  IntegrationType,
+  AdminAction,
   ErrorCode,
 
   // Entities
@@ -33,6 +35,8 @@ export type {
   Receipt,
   Epoch,
   Organization,
+  AdminEvent,
+  AgentAssignment,
   User,
   Export,
 
@@ -47,6 +51,9 @@ export type {
   RegisterAgentResponse,
   GetAgentResponse,
   ListAgentsResponse,
+  UpdateAgentRequest,
+  UpdateAgentResponse,
+  FreezeAgentResponse,
   UnfreezeAgentResponse,
   DeleteAgentResponse,
   SubmitOperationResponse,
@@ -66,6 +73,11 @@ export type {
   JWK,
   JWKSResponse,
   HealthResponse,
+  DeepHealthResponse,
+  ListWebhooksResponse,
+  RegisterWebhookResponse,
+  ListMembersResponse,
+  ListAdminEventsResponse,
   AuthRegisterResponse,
   AuthLoginResponse,
   ErrorResponse,