feat: add global config for captain settings (#13141)

Co-authored-by: aakashb95 <aakashbakhle@gmail.com>
Co-authored-by: Aakash Bakhle <48802744+aakashb95@users.noreply.github.com>

lib/llm/models.rb

@@ -0,0 +1,41 @@
+module Llm::Models
+  CONFIG = YAML.load_file(Rails.root.join('config/llm.yml')).freeze
+
+  class << self
+    def providers = CONFIG['providers']
+    def models = CONFIG['models']
+    def features = CONFIG['features']
+    def feature_keys = CONFIG['features'].keys
+
+    def default_model_for(feature)
+      CONFIG.dig('features', feature.to_s, 'default')
+    end
+
+    def models_for(feature)
+      CONFIG.dig('features', feature.to_s, 'models') || []
+    end
+
+    def valid_model_for?(feature, model_name)
+      models_for(feature).include?(model_name.to_s)
+    end
+
+    def feature_config(feature_key)
+      feature = features[feature_key.to_s]
+      return nil unless feature
+
+      {
+        models: feature['models'].map do |model_name|
+          model = models[model_name]
+          {
+            id: model_name,
+            display_name: model['display_name'],
+            provider: model['provider'],
+            coming_soon: model['coming_soon'],
+            credit_multiplier: model['credit_multiplier']
+          }
+        end,
+        default: feature['default']
+      }
+    end
+  end
+end