Vision model support for Qwen-OAuth (#525)

* refactor: openaiContentGenerator

* refactor: optimize stream handling

* refactor: re-organize refactored files

* fix: unit test cases

* feat: `/model` command for switching to vision model

* fix: lint error

* feat: add image tokenizer to fit vlm context window

* fix: lint and type errors

* feat: add `visionModelPreview` to control default visibility of vision models

* fix: remove deprecated files

* fix: align supported image formats with bailian doc

packages/cli/src/services/BuiltinCommandLoader.ts

@@ -35,6 +35,7 @@ import { settingsCommand } from '../ui/commands/settingsCommand.js';
 import { vimCommand } from '../ui/commands/vimCommand.js';
 import { setupGithubCommand } from '../ui/commands/setupGithubCommand.js';
 import { terminalSetupCommand } from '../ui/commands/terminalSetupCommand.js';
+import { modelCommand } from '../ui/commands/modelCommand.js';
 import { agentsCommand } from '../ui/commands/agentsCommand.js';
 
 /**
@@ -71,6 +72,7 @@ export class BuiltinCommandLoader implements ICommandLoader {
       initCommand,
       mcpCommand,
       memoryCommand,
+      modelCommand,
       privacyCommand,
       quitCommand,
       quitConfirmCommand,