🔧 refactor(dto): update BudgetTokens handling in Thinking struct

dto/claude.go

@@ -178,7 +178,14 @@ type ClaudeRequest struct {
 
 type Thinking struct {
 	Type         string `json:"type"`
-	BudgetTokens int    `json:"budget_tokens"`
+	BudgetTokens *int   `json:"budget_tokens,omitempty"`
+}
+
+func (c *Thinking) GetBudgetTokens() int {
+	if c.BudgetTokens == nil {
+		return 0
+	}
+	return *c.BudgetTokens
 }
 
 func (c *ClaudeRequest) IsStringSystem() bool {

relay/channel/claude/relay-claude.go

@@ -113,7 +113,7 @@ func RequestOpenAI2ClaudeMessage(textRequest dto.GeneralOpenAIRequest) (*dto.Cla
 		// BudgetTokens 为 max_tokens 的 80%
 		claudeRequest.Thinking = &dto.Thinking{
 			Type:         "enabled",
-			BudgetTokens: int(float64(claudeRequest.MaxTokens) * model_setting.GetClaudeSettings().ThinkingAdapterBudgetTokensPercentage),
+			BudgetTokens: common.GetPointer[int](int(float64(claudeRequest.MaxTokens) * model_setting.GetClaudeSettings().ThinkingAdapterBudgetTokensPercentage)),
 		}
 		// TODO: 临时处理
 		// https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking#important-considerations-when-using-extended-thinking

relay/claude_handler.go

@@ -98,7 +98,7 @@ func ClaudeHelper(c *gin.Context) (claudeError *dto.ClaudeErrorWithStatusCode) {
 			// BudgetTokens 为 max_tokens 的 80%
 			textRequest.Thinking = &dto.Thinking{
 				Type:         "enabled",
-				BudgetTokens: int(float64(textRequest.MaxTokens) * model_setting.GetClaudeSettings().ThinkingAdapterBudgetTokensPercentage),
+				BudgetTokens: common.GetPointer[int](int(float64(textRequest.MaxTokens) * model_setting.GetClaudeSettings().ThinkingAdapterBudgetTokensPercentage)),
 			}
 			// TODO: 临时处理
 			// https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking#important-considerations-when-using-extended-thinking

service/convert.go

@@ -21,10 +21,10 @@ func ClaudeToOpenAIRequest(claudeRequest dto.ClaudeRequest, info *relaycommon.Re
 
 	isOpenRouter := info.ChannelType == common.ChannelTypeOpenRouter
 
-	if claudeRequest.Thinking != nil {
+	if claudeRequest.Thinking != nil && claudeRequest.Thinking.Type == "enabled" {
 		if isOpenRouter {
 			reasoning := openrouter.RequestReasoning{
-				MaxTokens: claudeRequest.Thinking.BudgetTokens,
+				MaxTokens: claudeRequest.Thinking.GetBudgetTokens(),
 			}
 			reasoningJSON, err := json.Marshal(reasoning)
 			if err != nil {