- Add LIGHTRAG_MULTI_TENANT env var to control multi-tenant mode
- Add multi_tenant_enabled flag to /auth-status and /health endpoints
- Update LoginPage to auto-redirect in single-tenant mode
- Update App.tsx to set default tenant/KB in single-tenant mode
- Update TenantSelector to skip API calls in single-tenant mode
- Update SiteHeader to hide tenant selector in single-tenant mode
- Update useTenantInitialization hook to skip in single-tenant mode
- Update AuthStore with multiTenantEnabled state
In single-tenant mode (default):
- No tenant selection UI shown
- Auto-creates default tenant and KB context
- Direct access to all WebUI features
In multi-tenant mode (LIGHTRAG_MULTI_TENANT=true):
- Shows tenant/KB selection UI
- Requires tenant API routes to be configured
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