Add BackPRO News theme and update database schema for article tracking

- Introduced a new WordPress theme "BackPRO News" with a lightweight magazine-style design.
- Added columns for tracking retry attempts and timestamps for unpublished/generated articles in the articles table.
- Included remote service metadata fields in the sites table for better management.
- Created log files for image replacements, installer actions, OpenAI article generation, and publishing processes.
- Implemented a dashboard template for site management, including permalink settings and theme installation options.

assets/wp-theme-backpro-news/footer.php

@@ -0,0 +1,16 @@
+<?php if (!defined('ABSPATH')) { exit; } ?>
+    </div>
+</main>
+
+<footer class="bp-footer">
+    <div class="bp-shell">
+        <div>
+            <?php echo esc_html(get_bloginfo('name')); ?> &copy; <?php echo esc_html(date('Y')); ?>
+        </div>
+    </div>
+</footer>
+
+<?php wp_footer(); ?>
+</body>
+</html>
+