feat: add qwen3.6-plus model to ModelStudio Coding Plan (#3015)

- Add qwen3.6-plus to both China and Global/Intl regions as the first
  model in the Coding Plan template (1M context, enable_thinking)
- Set qwen3.6-plus as the new default MAINLINE_CODER_MODEL
- Add image+video input modality support for qwen3.6-plus

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/ui/hooks/useCodingPlanUpdates.test.ts

@@ -391,9 +391,9 @@ describe('useCodingPlanUpdates', () => {
       >;
 
       // Should have new China configs + custom config only (global config removed since regions are mutually exclusive)
-      // The China template has 8 models, so we expect 8 (from template) + 1 (custom) = 9
+      // The China template has 9 models, so we expect 9 (from template) + 1 (custom) = 10
       // Note: description field has been removed, only name field contains the branding
-      expect(updatedConfigs.length).toBe(9);
+      expect(updatedConfigs.length).toBe(10);
 
       // Should NOT contain the Global config (mutually exclusive)
       expect(