Add account API key management

src/openapi/security.ts

@@ -5,7 +5,8 @@ export const securitySchemes = {
     type: 'http' as const,
     scheme: 'bearer',
     bearerFormat: 'JWT',
-    description: 'Token returned by POST /api/auth/login.',
+    description:
+      'Token returned by POST /api/auth/login, or an API key (`umami_…`) created under Settings → API keys (self-hosted only).',
   },
   shareToken: {
     type: 'apiKey' as const,