WooCommerce plugin 2.6.0

• WordPress Multisite support: network-level activation, per-connector site targeting with multisite synchronization settings modal.
• Multisite orchestrator: centralized sync queue with switch_to_blog() distribution to selected subsites.
• Multi-connector reference counting system (Multiconn): prevents incorrect item deletion when multiple connectors share the same comp_id.
• Add Connector modal dialog in the Connectors page, replacing the legacy standalone page.
• AJAX-based connector creation with inline validation and feedback messages.
• Empty state view in Connectors page when no connectors exist (no redirect).
• Clean orphaned multiconn tool in Plugin Tools to remove records from deactivated sites.
• Removed legacy Add Connector page and submenu entry.
• Connector creation feedback now displays inline instead of as a WordPress admin notice.
• Updated How To Start, FAQ and README documentation to reflect the new Add Connector flow.
• Unified modal styling across Add Connector and Multisite modals (consistent header, buttons, theme colors).