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.

migrations/001_initial.sql

@@ -16,7 +16,7 @@ CREATE TABLE IF NOT EXISTS sites (
     url VARCHAR(255) NOT NULL,
     api_user VARCHAR(100) NOT NULL,
     api_token VARCHAR(255) NOT NULL,
-    publish_interval_days INT NOT NULL DEFAULT 3,
+    publish_interval_hours INT NOT NULL DEFAULT 24,
     last_published_at DATETIME NULL,
     is_active TINYINT(1) NOT NULL DEFAULT 1,
     is_multisite TINYINT(1) NOT NULL DEFAULT 0,
@@ -79,4 +79,5 @@ INSERT INTO settings (`key`, value) VALUES
     ('openai_model', 'gpt-4o'),
     ('image_provider', 'freepik'),
     ('article_min_words', '800'),
-    ('article_max_words', '1200');
+    ('article_max_words', '1200')
+ON DUPLICATE KEY UPDATE value = value;