Add protocol selection to Claude and Codex provider forms referencing CCSwitch

internal/config/config.go

@@ -46,7 +46,15 @@ type Models struct {
 	Extra   map[string]string `json:"extra,omitempty"`
 }
 
-// Provider is one upstream Chat Completions endpoint.
+// Supported upstream protocols (matching CCSwitch format identifiers).
+const (
+	ProtocolAnthropic       = "anthropic"
+	ProtocolOpenAIChat      = "openai_chat"
+	ProtocolOpenAIResponses = "openai_responses"
+	ProtocolGeminiNative    = "gemini_native"
+)
+
+// Provider is one upstream endpoint.
 type Provider struct {
 	ID               string    `json:"id"`
 	Name             string    `json:"name"`
@@ -54,6 +62,8 @@ type Provider struct {
 	BaseURL          string    `json:"base_url"`
 	APIKey           string    `json:"api_key"`
 	Models           Models    `json:"models"`
+	Protocol         string    `json:"protocol,omitempty"`
+	APIFormat        string    `json:"api_format,omitempty"`
 	EnabledForClaude bool      `json:"enabled_for_claude"`
 	EnabledForCodex  bool      `json:"enabled_for_codex"`
 	Target           string    `json:"target,omitempty"`
@@ -170,6 +180,13 @@ func (c *Config) normalize() {
 	}
 	for i := range c.Providers {
 		c.Providers[i].Models.normalize()
+		if c.Providers[i].Protocol == "" && c.Providers[i].APIFormat != "" {
+			c.Providers[i].Protocol = c.Providers[i].APIFormat
+		}
+		if c.Providers[i].Protocol == "" {
+			c.Providers[i].Protocol = ProtocolOpenAIChat
+		}
+		c.Providers[i].APIFormat = c.Providers[i].Protocol
 		switch c.Providers[i].Target {
 		case TargetClaude, TargetCodex:
 		default:
@@ -206,7 +223,7 @@ func (c *Config) clone() *Config {
 	return &out
 }
 
-func newProvider(name, preset, baseURL, apiKey string, models Models, target string) (*Provider, error) {
+func newProvider(name, preset, baseURL, apiKey string, models Models, target string, protocol ...string) (*Provider, error) {
 	name = strings.TrimSpace(name)
 	if name == "" {
 		return nil, errors.New("name is required")
@@ -231,6 +248,13 @@ func newProvider(name, preset, baseURL, apiKey string, models Models, target str
 	default:
 		return nil, fmt.Errorf("target must be %q or %q", TargetClaude, TargetCodex)
 	}
+	proto := ""
+	if len(protocol) > 0 {
+		proto = strings.TrimSpace(protocol[0])
+	}
+	if proto == "" {
+		proto = ProtocolOpenAIChat
+	}
 	return &Provider{
 		ID:        newID("p_"),
 		Name:      name,
@@ -238,6 +262,8 @@ func newProvider(name, preset, baseURL, apiKey string, models Models, target str
 		BaseURL:   strings.TrimRight(baseURL, "/"),
 		APIKey:    apiKey,
 		Models:    models,
+		Protocol:  proto,
+		APIFormat: proto,
 		Target:    target,
 		CreatedAt: time.Now().UTC(),
 	}, nil