Add installer functionality for WordPress with FTP and database configuration

- Create SQL migration for prompt templates used in article and image generation.
- Add migration to change publish interval from days to hours in the sites table.
- Implement InstallerController to handle installation requests and validation.
- Develop FtpService for FTP connections and file uploads.
- Create InstallerService to manage the WordPress installation process, including downloading, extracting, and configuring WordPress.
- Add index view for the installer with form inputs for FTP, database, and WordPress admin settings.
- Implement progress tracking for the installation process with AJAX polling.

src/Models/Site.php

@@ -19,7 +19,7 @@ class Site extends Model
                 WHERE is_active = 1
                 AND (
                     last_published_at IS NULL
-                    OR DATE_ADD(last_published_at, INTERVAL publish_interval_days DAY) <= NOW()
+                    OR DATE_ADD(last_published_at, INTERVAL publish_interval_hours HOUR) <= NOW()
                 )
                 ORDER BY last_published_at ASC";
         $stmt = self::db()->query($sql);