Add settings-driven Artisan scheduler registry with Etsy sync and token refresh jobs

Introduces App\Support\DashboardSchedule (modelled on LHITS_Dashboard's
pattern) as a single settings-driven registry for recurring Artisan jobs,
replacing the two hard-coded Schedule::command() lines in
routes/console.php.

Migrated unchanged:
- integrations_refresh (integrations:refresh), every_30_seconds, withoutOverlapping(5)
- alerts_scan (alerts:scan), every_30_seconds, withoutOverlapping(5)

New:
- etsy_sync (etsy:sync), every_15_minutes - forces a fresh pull of Etsy
  receipts/listings into the existing IntegrationCache entries, decoupled
  from the bundled integrations:refresh job so it can be tuned/disabled
  independently of Parcel2Go/BamBuddy/dryer refreshes.
- etsy_token_refresh (etsy:refresh-token), every_45_minutes - proactively
  refreshes the Etsy OAuth token (tokens last ~1hr) via a new public
  Etsy::refreshAccessToken() wrapper around the existing on-demand
  accessToken() refresh logic, so the connection survives quiet periods.

Frequency is persisted to storage/app/dashboard-schedules.json (no
app_settings table exists in this app, unlike LHITS's AppSetting-backed
store) and surfaced in a new 'Scheduler' section on the existing Settings
page (ScheduleSettingsController + routes), with per-job frequency
dropdowns and manual 'Run now' buttons, matching the page's existing
Tailwind conventions.

Tests: SchedulerTest (registry/frequency behavior), ScheduleSettingsTest
(settings UI + authorization), EtsySyncScheduledJobsTest (new commands,
Http::fake only, no live Etsy calls).

routes/web.php

@@ -10,6 +10,7 @@ use App\Http\Controllers\IntegrationSettingsController;
 use App\Http\Controllers\NotificationController;
 use App\Http\Controllers\Parcel2GoConnectionController;
 use App\Http\Controllers\PrinterController;
+use App\Http\Controllers\ScheduleSettingsController;
 use App\Http\Controllers\ShippingController;
 use App\Http\Controllers\UserController;
 use App\Http\Middleware\EnsureAccountActive;
@@ -42,6 +43,8 @@ Route::middleware(['auth', EnsureAccountActive::class])->group(function (): void
     Route::get('/settings', [EtsySettingsController::class, 'index'])->name('settings.index');
     Route::put('/settings/etsy', [EtsySettingsController::class, 'update'])->name('settings.etsy.update');
     Route::put('/settings/integrations/{provider}', [IntegrationSettingsController::class, 'update'])->name('settings.integrations.update');
+    Route::put('/settings/schedules', [ScheduleSettingsController::class, 'update'])->name('settings.schedules.update');
+    Route::post('/settings/schedules/{job}/run', [ScheduleSettingsController::class, 'run'])->name('settings.schedules.run');
     Route::get('/dryer', [DryerController::class, 'index'])->name('dryer');
     Route::get('/dryer/status', [DryerController::class, 'status'])->name('dryer.status');
     Route::post('/dryer/control', [DryerController::class, 'control'])->name('dryer.control');