Refactor model type to model class (#14426)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/entity/model.go

@@ -159,7 +159,7 @@ type Model struct {
 	MaxTokens    int            `json:"max_tokens"`
 	ModelTypes   []string       `json:"model_types"`
 	Thinking     *ModelThinking `json:"thinking"`
-	Type         *string        `json:"type"`
+	Class        *string        `json:"class"`
 	ModelTypeMap map[string]bool
 }
 
@@ -170,7 +170,7 @@ type Provider struct {
 	URLSuffix   models.URLSuffix  `json:"url_suffix"`
 	Models      []*Model          `json:"models"`
 	Features    Features          `json:"features"`
-	Type        string            `json:"type"`
+	Class       string            `json:"class"`
 	ModelDriver models.ModelDriver
 }
 
@@ -228,12 +228,12 @@ func NewProviderManager(dirPath string) (*ProviderManager, error) {
 
 		for _, model := range provider.Models {
 			// if the prefix of mode.Name is matched with keys of modelSupportThinking
-			if provider.Type == "" {
+			if provider.Class == "" {
 				pos := strings.Index(model.Name, "-")
-				modelType := model.Name[0:pos]
-				model.Type = &modelType
+				modelClass := model.Name[0:pos]
+				model.Class = &modelClass
 			} else {
-				model.Type = &provider.Name
+				model.Class = &provider.Name
 			}
 
 			model.ModelTypeMap = make(map[string]bool)

internal/entity/models/gitee.go

@@ -172,7 +172,7 @@ func (z *GiteeModel) Chat(modelName, message *string, apiConfig *APIConfig, chat
 		return nil, fmt.Errorf("invalid content format")
 	}
 
-	thinking, answer := GetThinkingAndAnswer(chatModelConfig.ModelType, &content)
+	thinking, answer := GetThinkingAndAnswer(chatModelConfig.ModelClass, &content)
 
 	chatResponse := &ChatResponse{
 		Answer:        answer,

internal/entity/models/siliconflow.go

@@ -56,7 +56,6 @@ func (z *SiliconflowModel) Name() string {
 	return "siliconflow"
 }
 
-
 // SiliconflowRerankRequest represents SILICONFLOW rerank request
 type SiliconflowRerankRequest struct {
 	Model           string   `json:"model"`
@@ -192,7 +191,7 @@ func (z *SiliconflowModel) Chat(modelName, message *string, apiConfig *APIConfig
 		return nil, fmt.Errorf("invalid content format")
 	}
 
-	thinking, answer := GetThinkingAndAnswer(chatModelConfig.ModelType, &content)
+	thinking, answer := GetThinkingAndAnswer(chatModelConfig.ModelClass, &content)
 
 	chatResponse := &ChatResponse{
 		Answer:        answer,

internal/entity/models/types.go

@@ -60,7 +60,7 @@ type ChatConfig struct {
 	TopP        *float64
 	DoSample    *bool
 	Stop        *[]string
-	ModelType   *string
+	ModelClass  *string
 	Effort      *string
 	Verbosity   *string
 }

internal/service/model_service.go

@@ -643,7 +643,7 @@ func (m *ModelProviderService) ChatToModel(providerName, instanceName, modelName
 			return nil, common.CodeNotFound, errors.New(fmt.Sprintf("provider %s model %s not found", providerName, modelName))
 		}
 
-		modelConfig.ModelType = model.Type
+		modelConfig.ModelClass = model.Class
 
 		var extra map[string]string
 		err = json.Unmarshal([]byte(instance.Extra), &extra)