mcp-nexus

## 1. Admin UI activation flow - [x] 1.1 Replace the Grok enable checkbox interaction with a clear enable/disable action button behavior. - [x] 1.2 After provider API key save, auto-enable Grok tools when currently disabled. - [x] 1.3 Refresh server state after provider save so status badges reflect persisted settings. ## 2. Runtime consistency - [x] 2.1 Reduce Grok settings cache staleness window in server settings reads. ## 3. Verification - [x] 3.1 Run admin-ui tests and project build to ensure no regressions.