feat(explore): allow deleting source categories

apps/web_v1/src/pages/workspace-explore.tsx

@@ -372,9 +372,7 @@ export function WorkspaceExplorePage({
                 {source.id !== 'all' ? (
                   <span className="explore-source-actions" onClick={(event) => event.stopPropagation()}>
                     <Button aria-label={`编辑${source.name}`} type="text" size="mini" icon={<IconEdit />} onClick={() => openEditSource(source)} />
-                    {!source.builtIn ? (
-                      <Button aria-label={`删除${source.name}`} type="text" size="mini" status="danger" icon={<IconDelete />} onClick={() => deleteSource(source)} />
-                    ) : null}
+                    <Button aria-label={`删除${source.name}`} type="text" size="mini" status="danger" icon={<IconDelete />} onClick={() => deleteSource(source)} />
                   </span>
                 ) : null}
               </Card>