Export/Import should support single-site WordPress installs

[superdav42]

Enhancement

The export functionality should support single-site (non-multisite) WordPress installs. Currently:

1. The WordPress Sites page integration (setup_wordpress_sites_integration) only works in multisite because it uses network_admin_menu, manage_sites_action_links, etc.
2. The export form at add_wp_sites_row_actions() line 146 skips the main site: if (is_main_site($blog_id)) return $actions;
3. The import creates new sites via wp_insert_site() which only works in multisite
4. The CLI mu-migration commands assume multisite context

For a single-site WordPress install:

• Export should work by exporting the entire site's database and uploads
• Import should work by overwriting the current site's database and uploads (with confirmation)
• The export menu should be accessible from Tools > Export & Import (not just network admin)

Use Cases

1. Migrating a single WP site TO a multisite network
2. Creating a backup of a single site
3. Cloning a single site to another server
4. Migrating from a single site to Ultimate Multisite

Suggested Implementation

• Add admin_menu hook (not just network_admin_menu) for single-site installs
• Remove the is_main_site() skip for single-site context
• For single-site import, overwrite the existing database tables instead of creating a new site
• Add a wp wu export / wp wu import CLI command that works in both single and multisite

Files to modify

• EDIT: inc/site-exporter/class-site-exporter.php:110-132 — add single-site admin menu support
• EDIT: inc/site-exporter/class-site-exporter.php:143-166 — handle single-site row actions
• EDIT: inc/site-exporter/mu-migration/includes/commands/class-mu-migration-import.php:460-467 — handle non-multisite import

Severity

Medium — feature gap for single-site users.

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