feat: add MiniMax provider support for model name routing

Add MiniMax as a supported provider so models like 'MiniMax-M2.5' are
automatically routed without requiring explicit provider configuration.

- Add MiniMax field to ProvidersConfig struct
- Add 'minimax' case in explicit provider selection
- Add model name fallback detection for 'minimax' prefix

pkg/config/config.go

@@ -179,6 +179,7 @@ type ProvidersConfig struct {
 	Moonshot      ProviderConfig `json:"moonshot"`
 	ShengSuanYun  ProviderConfig `json:"shengsuanyun"`
 	DeepSeek      ProviderConfig `json:"deepseek"`
+	MiniMax       ProviderConfig `json:"minimax"`
 	GitHubCopilot ProviderConfig `json:"github_copilot"`
 }
 
@@ -305,6 +306,7 @@ func DefaultConfig() *Config {
 			Nvidia:       ProviderConfig{},
 			Moonshot:     ProviderConfig{},
 			ShengSuanYun: ProviderConfig{},
+			MiniMax:      ProviderConfig{},
 		},
 		Gateway: GatewayConfig{
 			Host: "0.0.0.0",

pkg/providers/http_provider.go

@@ -327,6 +327,15 @@ func CreateProvider(cfg *config.Config) (LLMProvider, error) {
 				apiBase = "localhost:4321"
 			}
 			return NewGitHubCopilotProvider(apiBase, cfg.Providers.GitHubCopilot.ConnectMode, model)
+		case "minimax":
+			if cfg.Providers.MiniMax.APIKey != "" {
+				apiKey = cfg.Providers.MiniMax.APIKey
+				apiBase = cfg.Providers.MiniMax.APIBase
+				proxy = cfg.Providers.MiniMax.Proxy
+				if apiBase == "" {
+					apiBase = "https://api.minimax.chat/v1"
+				}
+			}
 
 		}
 
@@ -409,6 +418,13 @@ func CreateProvider(cfg *config.Config) (LLMProvider, error) {
 				apiBase = "http://localhost:11434/v1"
 			}
 			fmt.Println("Ollama apiBase:", apiBase)
+		case (strings.Contains(lowerModel, "minimax") || strings.HasPrefix(model, "minimax/")) && cfg.Providers.MiniMax.APIKey != "":
+			apiKey = cfg.Providers.MiniMax.APIKey
+			apiBase = cfg.Providers.MiniMax.APIBase
+			proxy = cfg.Providers.MiniMax.Proxy
+			if apiBase == "" {
+				apiBase = "https://api.minimax.chat/v1"
+			}
 		case cfg.Providers.VLLM.APIBase != "":
 			apiKey = cfg.Providers.VLLM.APIKey
 			apiBase = cfg.Providers.VLLM.APIBase