fix(theme): improve post-grid spacing, pagination and archive templates

- Fix flexbox gap issue causing unequal horizontal/vertical spacing
- Reset Bootstrap row/col margins to use only CSS gap property
- Replace WordPress pagination with Bootstrap-style pagination
- Add cta-post component to category.php and archive.php templates
- Fix spacing controls UI with separate horizontal/vertical gap fields
- Update FieldMapper with new gap_horizontal and gap_vertical attributes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

category.php

@@ -53,6 +53,13 @@ $main_col_class = $show_sidebar ? 'col-lg-9' : 'col-lg-12';
             }
             ?>
 
+            <!-- CTA Post - Componente dinamico -->
+            <?php
+            if (function_exists('roi_render_component')) {
+                echo roi_render_component('cta-post');
+            }
+            ?>
+
         </div><!-- .<?php echo esc_attr($main_col_class); ?> -->
 
         <?php if ($show_sidebar): ?>