Resolve profiles through built-in backends

internal/domain/domain.go

@@ -81,6 +81,7 @@ type RunResult struct {
 	PromptHash           string
 	RenderedPromptHash   string
 	SelectedProfileID    string
+	SelectedBackendID    string
 	ModelName            string
 	Endpoint             string
 	EffectiveModelParams ExecutionTarget
@@ -98,6 +99,7 @@ type PreparedRun struct {
 	PromptVersion        string                  `json:"prompt_version,omitempty"`
 	PromptHash           string                  `json:"prompt_hash,omitempty"`
 	SelectedProfileID    string                  `json:"selected_profile_id"`
+	SelectedBackendID    string                  `json:"selected_backend_id,omitempty"`
 	EffectiveModelParams ExecutionTarget         `json:"effective_model_params"`
 	TargetPresence       ExecutionTargetPresence `json:"-"`
 	OutputContract       OutputContract          `json:"output_contract"`
@@ -168,6 +170,7 @@ type Backend struct {
 // ExecutionProfile describes how and where to execute a model.
 type ExecutionProfile struct {
 	ID              string         `yaml:"id"`
+	BackendID       string         `yaml:"backend"`
 	Endpoint        string         `yaml:"endpoint"`
 	Model           string         `yaml:"model"`
 	Temperature     float64        `yaml:"temperature"`
@@ -206,6 +209,7 @@ type ExecutionTargetPresence struct {
 
 // ExecutionTarget represents effective model runtime settings for a run.
 type ExecutionTarget struct {
+	BackendID       string         `yaml:"backend" json:"backend_id,omitempty"`
 	Endpoint        string         `yaml:"endpoint" json:"endpoint"`
 	Model           string         `yaml:"model" json:"model"`
 	Temperature     float64        `yaml:"temperature" json:"temperature"`