fix(library): SQL workspace — (workspace != '' OR workspace_id IS NOT NULL)

Les pages du workspace local ont workspace='' mais workspace_id=27.
Le filtre workspace != '' les excluait, retournant 0 items.
Ajout de OR workspace_id IS NOT NULL pour inclure les pages locales.
Simplification du frontend: le workspace tab appelle l'API standard avec workspace_id.

app/routers/library.py

@@ -445,7 +445,7 @@ async def library_workspace(
         source_type = "all"
 
     uid = _get_user_id(request)
-    query = f"{BASE_SELECT} FROM pages p WHERE p.workspace != '' AND p.parent_section != 'Trash' AND p.deleted_at IS NULL"
+    query = f"{BASE_SELECT} FROM pages p WHERE (p.workspace != '' OR p.workspace_id IS NOT NULL) AND p.parent_section != 'Trash' AND p.deleted_at IS NULL"
     params: list = []
 
     if workspace_id: