feat: Add XML file management functionality

- Created XmlFiles control class for handling XML file views and regeneration.
- Implemented method to retrieve clients with XML feeds in the factory class.
- Added database migration to include google_merchant_account_id in clients table.
- Created migrations for products_keyword_planner_terms and products_merchant_sync_log tables.
- Added campaign_keywords table migration for managing campaign keyword data.
- Developed main view template for displaying XML files and their statuses.
- Introduced a debug script for analyzing product URLs and their statuses.

templates/clients/main_view.php

@@ -13,6 +13,7 @@
           <th style="width: 60px;">#ID</th>
           <th>Nazwa klienta</th>
           <th>Google Ads Customer ID</th>
+          <th>Merchant Account ID</th>
           <th>Dane od</th>
           <th style="width: 120px; text-align: center;">Akcje</th>
         </tr>
@@ -30,6 +31,13 @@
                   <span class="text-muted">— brak —</span>
                 <?php endif; ?>
               </td>
+              <td>
+                <?php if ( !empty( $client['google_merchant_account_id'] ) ): ?>
+                  <span class="badge-id"><?= htmlspecialchars( $client['google_merchant_account_id'] ); ?></span>
+                <?php else: ?>
+                  <span class="text-muted">— brak —</span>
+                <?php endif; ?>
+              </td>
               <td>
                 <?php if ( $client['google_ads_start_date'] ): ?>
                   <?= $client['google_ads_start_date']; ?>
@@ -49,7 +57,7 @@
           <?php endforeach; ?>
         <?php else: ?>
           <tr>
-            <td colspan="5" class="empty-state">
+            <td colspan="6" class="empty-state">
               <i class="fa-solid fa-building"></i>
               <p>Brak klientów. Dodaj pierwszego klienta.</p>
             </td>
@@ -78,6 +86,11 @@
           <label for="client-gads-id">Google Ads Customer ID</label>
           <input type="text" id="client-gads-id" name="google_ads_customer_id" class="form-control" placeholder="np. 123-456-7890 (opcjonalnie)" />
         </div>
+        <div class="settings-field">
+          <label for="client-gmc-id">Merchant Account ID</label>
+          <input type="text" id="client-gmc-id" name="google_merchant_account_id" class="form-control" placeholder="np. 123456789 (opcjonalnie)" />
+          <small class="text-muted">ID konta Merchant Center przypisane do klienta</small>
+        </div>
         <div class="settings-field">
           <label for="client-gads-start">Pobieraj dane od</label>
           <input type="date" id="client-gads-start" name="google_ads_start_date" class="form-control" />
@@ -99,6 +112,7 @@ function openClientForm()
   $( '#client-id' ).val( '' );
   $( '#client-name' ).val( '' );
   $( '#client-gads-id' ).val( '' );
+  $( '#client-gmc-id' ).val( '' );
   $( '#client-gads-start' ).val( '' );
   $( '#client-modal' ).fadeIn();
 }
@@ -115,6 +129,7 @@ function editClient( id )
     $( '#client-id' ).val( data.id );
     $( '#client-name' ).val( data.name );
     $( '#client-gads-id' ).val( data.google_ads_customer_id || '' );
+    $( '#client-gmc-id' ).val( data.google_merchant_account_id || '' );
     $( '#client-gads-start' ).val( data.google_ads_start_date || '' );
     $( '#client-modal' ).fadeIn();
   } );
@@ -126,10 +141,17 @@ function deleteClient( id, name )
     title: 'Potwierdzenie',
     content: 'Czy na pewno chcesz usunąć klienta <strong>' + name + '</strong>?',
     type: 'red',
+    onContentReady: function() {
+      if ( this['$$confirm'] && this['$$confirm'].length )
+      {
+        this['$$confirm'].trigger( 'focus' );
+      }
+    },
     buttons: {
       confirm: {
         text: 'Usuń',
         btnClass: 'btn-red',
+        keys: [ 'enter' ],
         action: function() {
           $.post( '/clients/delete', { id: id }, function( response ) {
             var data = JSON.parse( response );