Release: Plugin-Aware Ingestion

- Added runtime discovery for active plugin import tabs.

Highlights

Added runtime discovery for active plugin import tabs.
Upgraded the Import page to render generic plugin importer panels from runtime metadata.
Added transform-aware onImport and onCapture hook processing.
Documented the ingestion hook contract for plugin authors.

Why It Matters

MindStore ingestion is now more extensible in two dimensions at once: plugins can show up in the product import flow, and they can also modify import and capture batches before documents are indexed. This is an important step toward a real community importer ecosystem.