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>

app/Services/NotificationDispatcher.php

@@ -95,6 +95,43 @@ class NotificationDispatcher
         ]);
     }
 
+    public function tireSeasonalSwap(\App\Models\Tenant\TireSet $set): bool
+    {
+        $company = $this->companyFor($set);
+        $client = $set->client;
+        if (! $client) return false;
+
+        return $this->dispatch($company, $client, 'reminder', [
+            'telegram' => fn () => $this->tgTireSeasonalSwap($set, $company, $client),
+            'email' => fn () => $set->vehicle ? $this->emailSafe(
+                fn () => Mail::to($client->email)->send(new ServiceReminderMail(
+                    $set->vehicle,
+                    'tire_swap',
+                    'E timpul să schimbi anvelopele ' . ($set->season === 'winter' ? 'de iarnă' : 'de vară') .
+                        ' (' . $set->sizeLabel() . ').',
+                    $company
+                )),
+                'tireSeasonalSwap', ['set' => $set->id]
+            ) : false,
+        ]);
+    }
+
+    protected function tgTireSeasonalSwap(\App\Models\Tenant\TireSet $set, Company $company, Client $client): bool
+    {
+        $brand = htmlspecialchars($company->display_name ?? $company->name);
+        $size = htmlspecialchars($set->sizeLabel());
+        $seasonRo = $set->season === 'winter' ? 'de iarnă' : 'de vară';
+        $loc = $set->currentStorage()?->location;
+        $plate = $set->vehicle?->plate ? ' · ' . htmlspecialchars($set->vehicle->plate) : '';
+
+        $text = "🔧 <b>Schimb sezonier anvelope</b>\n"
+            . "Setul tău {$seasonRo} ({$size}){$plate}"
+            . ($loc ? " e în depozit la <b>{$loc}</b>." : '.')
+            . "\n\nProgramează-te la <b>{$brand}</b>.";
+
+        return $this->telegram->sendMessage($company, (string) $client->telegram_chat_id, $text);
+    }
+
     // ─── Channel dispatch ─────────────────────────────────────────
 
     /**