feat(openai): implement endpoint resolution and response handling for Chat and Responses models

sdk/api/handlers/openai/endpoint_compat.go

@@ -0,0 +1,37 @@
+package openai
+
+import "github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
+
+const (
+	openAIChatEndpoint      = "/chat/completions"
+	openAIResponsesEndpoint = "/responses"
+)
+
+func resolveEndpointOverride(modelName, requestedEndpoint string) (string, bool) {
+	if modelName == "" {
+		return "", false
+	}
+	info := registry.GetGlobalRegistry().GetModelInfo(modelName)
+	if info == nil || len(info.SupportedEndpoints) == 0 {
+		return "", false
+	}
+	if endpointListContains(info.SupportedEndpoints, requestedEndpoint) {
+		return "", false
+	}
+	if requestedEndpoint == openAIChatEndpoint && endpointListContains(info.SupportedEndpoints, openAIResponsesEndpoint) {
+		return openAIResponsesEndpoint, true
+	}
+	if requestedEndpoint == openAIResponsesEndpoint && endpointListContains(info.SupportedEndpoints, openAIChatEndpoint) {
+		return openAIChatEndpoint, true
+	}
+	return "", false
+}
+
+func endpointListContains(items []string, value string) bool {
+	for _, item := range items {
+		if item == value {
+			return true
+		}
+	}
+	return false
+}