chore(editor): hide file and doc import entries for mobile (#11648)

Close [BS-2926](https://linear.app/affine-design/issue/BS-2926/【移动端-ios】-选择import，无反应)
Close [BS-2927](https://linear.app/affine-design/issue/BS-2927/【移动端-ios】隐藏toolbar上附件入口)

blocksuite/affine/blocks/root/src/widgets/keyboard-toolbar/config.ts

@@ -428,8 +428,7 @@ const contentMediaToolGroup: KeyboardToolPanelGroup = {
     {
       name: 'Attachment',
       icon: AttachmentIcon(),
-      showWhen: ({ std }) =>
-        std.store.schema.flavourSchemaMap.has('affine:attachment'),
+      showWhen: () => false,
       action: async ({ std }) => {
         const [_, { selectedModels }] = std.command.exec(
           getSelectedModelsCommand
@@ -1029,8 +1028,7 @@ export const defaultKeyboardToolbarConfig: KeyboardToolbarConfig = {
     {
       name: 'Attachment',
       icon: AttachmentIcon(),
-      showWhen: ({ std }) =>
-        std.store.schema.flavourSchemaMap.has('affine:attachment'),
+      showWhen: () => false,
       action: async ({ std }) => {
         const [_, { selectedModels }] = std.command.exec(
           getSelectedModelsCommand