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/layout.blade.php

@@ -32,6 +32,9 @@
 
     .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
     .product { background: #fff; border: 1px solid #e5e7eb; border-radius: 12px; padding: 14px; display: flex; flex-direction: column; }
+    .product-thumb { display: block; aspect-ratio: 1; margin-bottom: 10px; border-radius: 8px; overflow: hidden; background: #f9fafb; border: 1px solid #f3f4f6; }
+    .product-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
+    .product-thumb-empty { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; font-size: 36px; color: #cbd5e1; }
     .product h3 { font-size: 14px; font-weight: 600; margin-bottom: 4px; min-height: 38px; }
     .product .meta { font-size: 12px; color: #6b7280; margin-bottom: 8px; }
     .product .price { font-size: 18px; font-weight: 700; color: {{ $themeColor }}; margin-top: auto; }