Use getter/setter methods for API key access in ModelConfig

pkg/config/config_test.go

@@ -1199,11 +1199,11 @@ func TestModelConfig_ExtraBodyRoundTrip(t *testing.T) {
 	cfgPath := filepath.Join(dir, "config.json")
 
 	cfg := &Config{
-		ModelList: []ModelConfig{
+		ModelList: []*ModelConfig{
 			{
 				ModelName: "test-model",
 				Model:     "openai/test",
-				APIKey:    "sk-test",
+				apiKeys:   []string{"sk-test"},
 				ExtraBody: map[string]any{"custom_field": "value", "num_field": 42},
 			},
 		},

pkg/providers/factory_provider.go

@@ -138,7 +138,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 
 	case "minimax":
 		// Minimax requires reasoning_split: true in the request body
-		if cfg.APIKey == "" && cfg.APIBase == "" {
+		if cfg.APIKey() == "" && cfg.APIBase == "" {
 			return nil, "", fmt.Errorf("api_key or api_base is required for HTTP-based protocol %q", protocol)
 		}
 		apiBase := cfg.APIBase
@@ -153,7 +153,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 			extraBody["reasoning_split"] = true
 		}
 		return NewHTTPProviderWithMaxTokensFieldAndRequestTimeout(
-			cfg.APIKey,
+			cfg.APIKey(),
 			apiBase,
 			cfg.Proxy,
 			cfg.MaxTokensField,

pkg/providers/factory_provider_test.go

@@ -622,9 +622,9 @@ func TestCreateProviderFromConfig_MinimaxInjectsReasoningSplit(t *testing.T) {
 	cfg := &config.ModelConfig{
 		ModelName: "test-minimax",
 		Model:     "minimax/MiniMax-M2.5",
-		APIKey:    "test-key",
 		APIBase:   server.URL,
 	}
+	cfg.SetAPIKey("test-key")
 
 	provider, modelID, err := CreateProviderFromConfig(cfg)
 	if err != nil {
@@ -670,10 +670,10 @@ func TestCreateProviderFromConfig_MinimaxPreservesUserExtraBody(t *testing.T) {
 	cfg := &config.ModelConfig{
 		ModelName: "test-minimax-custom",
 		Model:     "minimax/MiniMax-M2.5",
-		APIKey:    "test-key",
 		APIBase:   server.URL,
 		ExtraBody: map[string]any{"custom_field": "test"},
 	}
+	cfg.SetAPIKey("test-key")
 
 	provider, modelID, err := CreateProviderFromConfig(cfg)
 	if err != nil {

web/frontend/src/api/models.ts

@@ -17,7 +17,7 @@ export interface ModelInfo {
   max_tokens_field?: string
   request_timeout?: number
   thinking_level?: string
-  extra_body?: Record<string, any>
+  extra_body?: Record<string, unknown>
   // Meta
   configured: boolean
   is_default: boolean