Make request execution overrides presence-aware

internal/adapter/http/handler.go

@@ -61,9 +61,9 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	var model *domain.ExecutionTarget
+	var model *domain.ExecutionTargetOverride
 	if req.Model != nil {
-		model = executionTargetFromModelOverrideDTO(req.Model)
+		model = executionTargetOverrideFromModelOverrideDTO(req.Model)
 	}
 
 	res, err := h.runner.Run(r.Context(), domain.RunRequest{
@@ -123,11 +123,11 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, resp)
 }
 
-func executionTargetFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.ExecutionTarget {
+func executionTargetOverrideFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.ExecutionTargetOverride {
 	if dto == nil {
 		return nil
 	}
-	return &domain.ExecutionTarget{
+	return &domain.ExecutionTargetOverride{
 		Endpoint:        dto.Endpoint,
 		Model:           dto.Model,
 		Temperature:     dto.Temperature,
@@ -137,7 +137,7 @@ func executionTargetFromModelOverrideDTO(dto *modelOverrideRequestDTO) *domain.E
 		ServiceTier:     dto.ServiceTier,
 		ReasoningEffort: dto.ReasoningEffort,
 		APIKeyEnv:       dto.APIKeyEnv,
-		ExtraParams:     dto.ExtraParams,
+		ExtraParams:     stringMapToAnyMap(dto.ExtraParams),
 	}
 }
 
@@ -156,6 +156,17 @@ func modelParamsDTOFromExecutionTarget(target domain.ExecutionTarget) modelParam
 	}
 }
 
+func stringMapToAnyMap(src map[string]string) map[string]any {
+	if len(src) == 0 {
+		return nil
+	}
+	out := make(map[string]any, len(src))
+	for k, v := range src {
+		out[k] = v
+	}
+	return out
+}
+
 func mapValidation(v domain.ValidationResult) validationDTO {
 	return validationDTO{
 		Status:         string(v.Status),