feat: shop UX polish — password reset / order email / multi-image / customer admin

Shop password reset:
- Configured 'shop_customers' password broker on the existing
  password_reset_tokens table
- ShopCustomer::sendPasswordResetNotification overrides Laravel default to
  send a ShopPasswordResetMail with a tenant-subdomain reset URL
- Routes /shop/password/forgot, /shop/password/email, /shop/password/reset/{token}
  + ShopAuthController showForgotPassword/sendResetLink/showResetPassword/
  resetPassword. Forgot view stays generic ("if it exists, we sent…") to avoid
  email enumeration. Login view links to "Am uitat parola".

Order confirmation email:
- ShopOrderConfirmationMail + nicely formatted HTML email template
- ShopOrderNotifier::placed now also emails customer_email (best-effort,
  warning-only logged on failure) alongside existing Telegram + staff push

Multiple images per Part:
- Part media collection switched from singleFile to multiple (max 8 in form)
- imageUrls() helper for galleries; imageUrl() still returns first for cards
- PartResource form: reorderable multi-upload
- Shop part detail: vertical thumbnails switch the main image via vanilla JS

ShopCustomerResource (tenant Filament, "Magazin" nav group):
- List with name/phone/email/client_id/orders_count/last_login_at
- Edit (no password field exposed)
- "Trimite reset parolă" action uses the new broker
- OrdersRelationManager shows the customer's orders read-only

Tests (7 new):
- forgot sends mail; forgot doesn't disclose unknown email; reset with valid
  token changes password; bad token rejected; order email when customer_email
  set; email skipped without it; Part has imageUrls() collection

Full suite: 130 passed.

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

resources/views/shop/auth/login.blade.php

@@ -25,7 +25,13 @@
     </form>
 
     <p class="muted" style="text-align:center;margin-top:12px;">
-        Nu ai cont? <a href="/shop/register" style="color:inherit;text-decoration:underline;">Înregistrare</a>
+        <a href="/shop/password/forgot" style="color:inherit;text-decoration:underline;">Am uitat parola</a>
+        · Nu ai cont? <a href="/shop/register" style="color:inherit;text-decoration:underline;">Înregistrare</a>
     </p>
+    @if (session('status'))
+        <div class="card" style="border-color:#bbf7d0;background:#f0fdf4;margin-top:14px;color:#166534;font-size:14px;text-align:center;">
+            {{ session('status') }}
+        </div>
+    @endif
 </div>
 @endsection