Add Xiaomi MiMo provider (mimo-v2.5) support

internal/config/config.go

@@ -37,6 +37,7 @@ type ProviderConfig struct {
 	Moonshot MoonshotConfig `mapstructure:"moonshot"`
 	Grok     GrokConfig     `mapstructure:"grok"`
 	Ollama   OllamaConfig   `mapstructure:"ollama"`
+	Xiaomi   XiaomiConfig   `mapstructure:"xiaomi"`
 }
 
 type OpenAIConfig struct {
@@ -81,6 +82,13 @@ type OllamaConfig struct {
 	Models       []string `mapstructure:"models"`
 }
 
+type XiaomiConfig struct {
+	APIKeyEnv    string `mapstructure:"api_key_env"`
+	BaseURL      string `mapstructure:"base_url"`
+	DefaultModel string `mapstructure:"default_model"`
+	Enabled      bool   `mapstructure:"enabled"`
+}
+
 func Load() (*Config, error) {
 	v := viper.New()
 
@@ -120,6 +128,11 @@ func Load() (*Config, error) {
 	v.SetDefault("providers.ollama.enabled", false)
 	v.SetDefault("providers.ollama.models", []string{})
 
+	v.SetDefault("providers.xiaomi.api_key_env", "XIAOMI_API_KEY")
+	v.SetDefault("providers.xiaomi.base_url", "https://api.xiaomimimo.com/v1")
+	v.SetDefault("providers.xiaomi.default_model", "mimo-v2.5")
+	v.SetDefault("providers.xiaomi.enabled", true)
+
 	// Environment variables
 	v.SetEnvPrefix("LLM_PROXY")
 	v.SetEnvKeyReplacer(strings.NewReplacer(".", "__"))
@@ -210,6 +223,8 @@ func (c *Config) GetAPIKey(provider string) (string, error) {
 	case "ollama":
 		// Ollama doesn't require an API key
 		return "", nil
+	case "xiaomi":
+		envVar = c.Providers.Xiaomi.APIKeyEnv
 	default:
 		return "", fmt.Errorf("unknown provider: %s", provider)
 	}