feat(shell): enable PTY by default and various enhancements

### Shell & Interactive Terminal Improvements
- PTY shell is now enabled by default instead of disabled
- Improved shell output rendering, process termination, and added fallback warning
- Background commands now properly capture subprocess PIDs on non-Windows

### Coding Plan Improvements
- Simplified auth message, added /model tip, improved system info display
- Reordered model list to prioritize glm-5, kimi-k2.5, MiniMax-M2.5
- Model selection is now preserved when updating if the model still exists

### Other Changes
- Added shared symlink utility; debug logs now have latest alias
- Unknown settings warnings go to debug log instead of user-facing warnings
- Fixed subagent confirmation state detection
- Removed debug UI from AgentCreationWizard

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

packages/cli/src/config/settings.test.ts

@@ -448,7 +448,7 @@ describe('Settings Loading and Merging', () => {
       );
     });
 
-    it('should warn about unknown top-level keys in a v2 settings file', () => {
+    it('should silently ignore unknown top-level keys in a v2 settings file', () => {
       (mockFsExistsSync as Mock).mockImplementation(
         (p: fs.PathLike) => p === USER_SETTINGS_PATH,
       );
@@ -466,13 +466,7 @@ describe('Settings Loading and Merging', () => {
 
       const settings = loadSettings(MOCK_WORKSPACE_DIR);
 
-      expect(getSettingsWarnings(settings)).toEqual(
-        expect.arrayContaining([
-          expect.stringContaining(
-            "Unknown setting 'someUnknownKey' will be ignored",
-          ),
-        ]),
-      );
+      expect(getSettingsWarnings(settings)).toEqual([]);
     });
 
     it('should not warn for valid v2 container keys', () => {