feat(core): support gemini model switch in ai (#13631)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
- Subscription-aware AI model picker in chat: browse models with version
and category, see active selection, switch models, and receive
notifications when choosing pro models without a subscription.
Selections persist across sessions.
- Central AI model service wired into chat UI for consistent model
selection and availability.

- Changes
- Streamlined AI model availability: reduced to a curated set for a more
focused experience.
  - Context menu buttons can display supplemental info next to labels.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/modules/index.ts

@@ -4,6 +4,7 @@ import { type Framework } from '@toeverything/infra';
 import {
   configureAIButtonModule,
   configureAIDraftModule,
+  configureAIModelModule,
   configureAINetworkSearchModule,
   configureAIPlaygroundModule,
   configureAIReasoningModule,
@@ -117,6 +118,7 @@ export function configureCommonModules(framework: Framework) {
   configureAIButtonModule(framework);
   configureAIDraftModule(framework);
   configureAIToolsConfigModule(framework);
+  configureAIModelModule(framework);
   configureTemplateDocModule(framework);
   configureBlobManagementModule(framework);
   configureMediaModule(framework);