Resolve profiles through built-in backends

profiles.go

@@ -6,16 +6,21 @@ import (
 	"fmt"
 	"strings"
 
+	"gitea.maximumdirect.net/eric/promptkit/internal/backend"
 	"gitea.maximumdirect.net/eric/promptkit/internal/domain"
 	"gitea.maximumdirect.net/eric/promptkit/internal/profile"
 )
 
+// BackendOpenRouter identifies Promptkit's built-in OpenRouter backend.
+const BackendOpenRouter = backend.OpenRouterID
+
 // OpenAICompatibleProfile returns an ordinary in-memory Profile for an
 // OpenAI-compatible chat-completions endpoint.
 //
 // It does not register global state, maintain a model catalog, or resolve
 // credentials. If APIKeyRequired is true, callers satisfy it with
-// RunRequest.APIKey. Raw API keys do not belong in profiles.
+// RunRequest.APIKey or an explicit request ExecutionTargetOverride.APIKeyEnv.
+// Raw API keys do not belong in profiles.
 //
 // The function copies the ExtraParams map itself but does not recursively copy
 // nested values. Validation and a deep copy occur when NewEngine applies a
@@ -23,6 +28,7 @@ import (
 func OpenAICompatibleProfile(cfg OpenAICompatibleProfileConfig) Profile {
 	return Profile{
 		ID:              cfg.ID,
+		BackendID:       cfg.BackendID,
 		Endpoint:        cfg.Endpoint,
 		Model:           cfg.Model,
 		Temperature:     cfg.Temperature,
@@ -85,6 +91,7 @@ func toDomainProfile(publicProfile Profile) (domain.ExecutionProfile, error) {
 	}
 	prof := domain.ExecutionProfile{
 		ID:              strings.TrimSpace(publicProfile.ID),
+		BackendID:       strings.TrimSpace(publicProfile.BackendID),
 		Endpoint:        publicProfile.Endpoint,
 		Model:           publicProfile.Model,
 		Temperature:     publicProfile.Temperature,
@@ -106,8 +113,8 @@ func validatePublicProfile(prof domain.ExecutionProfile) error {
 	if strings.TrimSpace(prof.ID) == "" {
 		return errors.New("id is required")
 	}
-	if strings.TrimSpace(prof.Endpoint) == "" {
-		return errors.New("endpoint is required")
+	if strings.TrimSpace(prof.BackendID) == "" && strings.TrimSpace(prof.Endpoint) == "" {
+		return errors.New("backend or endpoint is required")
 	}
 	if strings.TrimSpace(prof.Model) == "" {
 		return errors.New("model is required")