7.77.0 — corbeille réparée (FK favorites/recents) + MCP workspaces

- detach_page_references : nettoyage des références NO ACTION avant
  toute suppression définitive (unitaire, Empty Trash, purge 30 j)
- MCP : list_workspaces / get_workspace ; descriptions collections
  clarifiées (bases de données, pas des workspaces)
- 96 tests verts sur le périmètre (MCP, trash, cohérence)

app/routers/board/sharing.py

@@ -16,6 +16,7 @@ from app.services.collection_lifecycle import (
     collections_hosted_by_page,
     collections_hosted_by_pages,
     delete_collections,
+    detach_page_references,
 )
 from app.services.publish import fire_published, fire_unpublished, publish, unpublish
 
@@ -199,6 +200,7 @@ def permanent_delete(request: Request, page_id: int):
         # tâches sans document.
         collections = collections_hosted_by_page(conn, page_id)
         conn.execute("UPDATE pages SET parent_id=NULL WHERE parent_id=?", (page_id,))
+        detach_page_references(conn, [page_id])
         conn.execute("DELETE FROM pages WHERE id=? AND deleted_at IS NOT NULL", (page_id,))
         delete_collections(conn, collections)
         conn.commit()
@@ -229,6 +231,7 @@ def empty_trash(request: Request):
             "UPDATE pages SET parent_id=NULL WHERE parent_id IN "
             "(SELECT id FROM pages WHERE deleted_at IS NOT NULL)"
         )
+        detach_page_references(conn, trashed)
         conn.execute("DELETE FROM pages WHERE deleted_at IS NOT NULL")
         delete_collections(conn, collections)
         conn.commit()