refactor(cursor-models): remove tier property from Cursor model configurations

- Removed the 'tier' property from Cursor model configurations and related UI components.
- Updated relevant files to reflect the removal of tier-related logic and display elements.
- This change simplifies the model structure and UI, focusing on essential attributes.

apps/ui/src/components/views/agent-view/shared/agent-model-selector.tsx

@@ -114,11 +114,6 @@ export function AgentModelSelector({
                         Thinking
                       </span>
                     )}
-                    {model.tier === 'pro' && (
-                      <span className="text-[10px] px-1.5 py-0.5 rounded bg-amber-500/10 text-amber-600 dark:text-amber-400">
-                        Pro
-                      </span>
-                    )}
                   </div>
                   <span className="text-xs text-muted-foreground">{model.description}</span>
                 </div>