feat: Enhance Claude default max tokens configuration

- Replace ThinkingAdapterMaxTokens with a more flexible DefaultMaxTokens map
- Add support for model-specific default max tokens configuration
- Update relay and web interface to use the new configuration approach
- Implement a fallback mechanism for default max tokens

setting/model_setting/claude.go

@@ -14,16 +14,18 @@ import (
 // ClaudeSettings 定义Claude模型的配置
 type ClaudeSettings struct {
 	HeadersSettings                       map[string]map[string][]string `json:"model_headers_settings"`
+	DefaultMaxTokens                      map[string]int                 `json:"default_max_tokens"`
 	ThinkingAdapterEnabled                bool                           `json:"thinking_adapter_enabled"`
-	ThinkingAdapterMaxTokens              int                            `json:"thinking_adapter_max_tokens"`
 	ThinkingAdapterBudgetTokensPercentage float64                        `json:"thinking_adapter_budget_tokens_percentage"`
 }
 
 // 默认配置
 var defaultClaudeSettings = ClaudeSettings{
-	HeadersSettings:                       map[string]map[string][]string{},
-	ThinkingAdapterEnabled:                true,
-	ThinkingAdapterMaxTokens:              8192,
+	HeadersSettings:        map[string]map[string][]string{},
+	ThinkingAdapterEnabled: true,
+	DefaultMaxTokens: map[string]int{
+		"default": 8192,
+	},
 	ThinkingAdapterBudgetTokensPercentage: 0.8,
 }
 
@@ -37,6 +39,10 @@ func init() {
 
 // GetClaudeSettings 获取Claude配置
 func GetClaudeSettings() *ClaudeSettings {
+	// check default max tokens must have default key
+	if _, ok := claudeSettings.DefaultMaxTokens["default"]; !ok {
+		claudeSettings.DefaultMaxTokens["default"] = 8192
+	}
 	return &claudeSettings
 }
 
@@ -50,3 +56,10 @@ func (c *ClaudeSettings) WriteHeaders(originModel string, httpHeader *http.Heade
 		}
 	}
 }
+
+func (c *ClaudeSettings) GetDefaultMaxTokens(model string) int {
+	if maxTokens, ok := c.DefaultMaxTokens[model]; ok {
+		return maxTokens
+	}
+	return c.DefaultMaxTokens["default"]
+}