feat(ui): add identity management for tenants and users

* Implement tenant and user creation in IdentityPage
* Add API calls for managing tenants and users
* Introduce tenant-scoped API requests
* Update sidebar to include identity navigation
* Create BooleanStatusBadge component for key status

ui/src/types.ts

@@ -66,7 +66,7 @@ export type NavItem = {
   disabled?: boolean;
 };
 
-export type ShellPage = 'dashboard' | 'projects' | 'thoughts' | 'learnings' | 'plans' | 'skills' | 'guardrails' | 'personas' | 'files' | 'maintenance';
+export type ShellPage = 'dashboard' | 'identity' | 'projects' | 'thoughts' | 'learnings' | 'plans' | 'skills' | 'guardrails' | 'personas' | 'files' | 'maintenance';
 
 export type Project = {
   id: string;
@@ -295,3 +295,33 @@ export type MetadataRetryResult = {
   failed: number;
   dry_run: boolean;
 };
+
+export type Tenant = {
+  id: string;
+  name: string;
+  created_at: string;
+};
+
+export type TenantUser = {
+  id: string;
+  tenant_id: string;
+  name: string;
+  email: string;
+  created_at: string;
+};
+
+export type IdentityKey = {
+  id: string;
+  tenant_id: string;
+  user_id?: string;
+  description: string;
+  source: 'configured' | 'managed';
+  enabled: boolean;
+  created_at: string;
+};
+
+export type IdentityData = {
+  tenants: Tenant[];
+  users: TenantUser[];
+  keys: IdentityKey[];
+};