feat: Part product images + seasonal tire-swap reminders

Part (HasMedia):
- Spatie media `image` single-file collection + imageUrl() helper
- PartResource form: image upload section (image editor, 2 MB max)
- Parts list: circular thumbnail column
- Shop catalog cards: square thumbnail + 📦 placeholder
- Shop part detail: 260px image alongside info, single column when no image

Seasonal tire-swap reminders:
- NotificationDispatcher::tireSeasonalSwap(TireSet) — Telegram first, email
  fallback (when set has a vehicle, via ServiceReminderMail with 'tire_swap'
  type and a size-aware note)
- tires:remind-seasonal artisan command, self-gating to Feb 15-Mar 15
  (notify winter sets stored) and Sep 15-Oct 15 (notify summer sets stored).
  60-day cooldown per client via service_reminders_sent. --force / --dry-run.
- Schedule: weekly Mon 09:30

Tests (6 new):
- outside window no-ops; spring window notifies winter; spring ignores summer;
  autumn notifies summer; cooldown blocks doubles; --force overrides window

Full suite: 106 passed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

resources/views/shop/catalog.blade.php

@@ -25,8 +25,15 @@
 @else
     <div class="grid">
         @foreach ($parts as $p)
-            @php $stock = (float) $p->qty; @endphp
+            @php $stock = (float) $p->qty; $img = $p->imageUrl(); @endphp
             <div class="product">
+                <a href="/shop/part/{{ $p->id }}" class="product-thumb">
+                    @if ($img)
+                        <img src="{{ $img }}" alt="{{ $p->name }}" loading="lazy">
+                    @else
+                        <div class="product-thumb-empty">📦</div>
+                    @endif
+                </a>
                 <a href="/shop/part/{{ $p->id }}">
                     <h3>{{ $p->name }}</h3>
                 </a>