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).

app/Services/Etsy.php

@@ -98,14 +98,14 @@ class Etsy
         return $total > 0 && $refunded >= $total;
     }
 
-    public function listings(EtsyConnection $connection): array
+    public function listings(EtsyConnection $connection, bool $fresh = false): array
     {
         return $this->cache->remember('etsy.listings.'.$connection->shop_id, 600, fn (): array => $this->request(
             'GET',
             'application/shops/'.$connection->shop_id.'/listings',
             $this->accessToken($connection),
             ['state' => 'active', 'limit' => 20],
-        ));
+        ), $fresh);
     }
 
     /**
@@ -392,6 +392,17 @@ class Etsy
         return $this->credentials()['redirect_uri'] ?: route('etsy.callback');
     }
 
+    /**
+     * Public wrapper around the on-demand token refresh logic, for the
+     * etsy:refresh-token scheduled command to call proactively so the OAuth
+     * connection stays alive even during quiet periods with no receipts or
+     * listings activity to trigger a refresh as a side effect.
+     */
+    public function refreshAccessToken(EtsyConnection $connection): string
+    {
+        return $this->accessToken($connection);
+    }
+
     private function accessToken(EtsyConnection $connection): string
     {
         if ($connection->expires_at->isFuture()) {