🚀 Release v2.4.1 — normalize commit model IDs, fix vendor prefix handling (#128)

## Change Log / Overview

Release v2.4.1 promoting the commit model ID normalization work.

### What's New
- **✍️ Normalize commit model IDs**: `commitModelIdOverride` now strips
the `litellm-connector/` vendor prefix when reading the setting, so IDs
copied directly from the model picker work with SCM commit-message
generation.
- **🔎 Namespaced model resolution**: Commit generation resolves
configured models from the discovered backend registry, including models
whose LiteLLM names contain nested slashes.

### Fixes
- Fixes #127

## Related Issues, Builds, Pipeline Runs, etc.
- #127

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### Pull Request Pre-check
- [x] Linting Validation Passed (0 errors, 31 warnings — warnings are
pre-existing)
- [x] Formatting Validation Passed
- [x] Unit Testing Passes (935 passing)
- [x] Documentation Updated (CHANGELOG.md, README.md,
README.marketplace.md)