fix(kimi): resolve API 401 errors from deprecated model fields

- Remove 5 deprecated model fields from Kimi settings causing auth failures
- Update config/base-kimi.settings.json template with clean configuration
- Add automatic migration in scripts/postinstall.js to remove deprecated fields
- Preserve user API keys and custom settings during migration
- Update CHANGELOG.md with v4.1.1 and v4.1.2 entries
- Bump version to 4.1.2 across all files and installers

Fixes authentication issues with Moonshot AI (Kimi) API due to deprecated
model parameters that are now rejected by the service.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@kaitranntt/ccs",
-  "version": "4.1.1",
+  "version": "4.1.2",
   "description": "Claude Code Switch - Instant profile switching between Claude Sonnet 4.5 and GLM 4.6",
   "keywords": [
     "cli",