## Description
Adds the foundation for feature-specific LLM model routing so Captain AI
features can resolve their effective provider/model from code defaults
and account-level overrides. This fixes the provider metadata key in
`config/llm.yml`, adds `Llm::FeatureRouter`, and routes existing
`CaptainFeaturable` model defaults through the shared resolver.
Fixes https://linear.app/chatwoot/issue/CW-7425/test-new-models
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update
## How Has This Been Tested?
- `bundle exec rspec spec/lib/llm/models_spec.rb
spec/lib/llm/feature_router_spec.rb
spec/models/concerns/captain_featurable_spec.rb` - 23 examples, 0
failures
- `bundle exec rubocop lib/llm/models.rb lib/llm/feature_router.rb
app/models/concerns/captain_featurable.rb spec/lib/llm/models_spec.rb
spec/lib/llm/feature_router_spec.rb
spec/models/concerns/captain_featurable_spec.rb` - no offenses
- `bundle exec ruby -e "require 'yaml'; config =
YAML.load_file('config/llm.yml'); abort('missing providers') unless
config['providers']; abort('missing models') unless config['models'];
abort('missing features') unless config['features']; puts 'llm.yml ok'"`
- `git diff --check`
## Checklist:
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules
