Refactor upgrade status to use Livewire instead of API endpoint

- Remove /api/upgrade-status endpoint and route
- Add getUpgradeStatus() method to Upgrade Livewire component
- Update frontend to call Livewire method via $wire.getUpgradeStatus()
- Simpler approach: no separate API, auth handled by Livewire

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

routes/api.php

@@ -25,11 +25,6 @@ Route::group([
     Route::get('/health', [OtherController::class, 'healthcheck']);
 });
 
-Route::middleware(['web', 'auth'])->group(function () {
-    Route::get('/upgrade-status', [OtherController::class, 'upgradeStatus']);
-    Route::get('/v1/upgrade-status', [OtherController::class, 'upgradeStatus']);
-});
-
 Route::post('/feedback', [OtherController::class, 'feedback']);
 
 Route::group([