添加对话上下文窗口管理

Co-Authored-By: Claude <noreply@anthropic.com>

config/config.go

@@ -13,6 +13,7 @@ import (
 const (
 	defaultOpenAIBaseURL        = "https://ark.cn-beijing.volces.com/api/v3"
 	defaultOpenAITimeout        = 120
+	defaultContextWindowTokens  = 262144
 	defaultToolRouterTimeout    = 30
 	defaultToolRouterMaxTokens  = 512
 	defaultToolRouterSystemText = `你可以按需直接调用可用工具来回答用户问题。
@@ -24,13 +25,14 @@ const (
 )
 
 type OpenAIConfig struct {
-	Name           string `yaml:"name" json:"name"`
-	Active         bool   `yaml:"active,omitempty" json:"active"`
-	APIKey         string `yaml:"api_key" json:"-"`
-	BaseURL        string `yaml:"base_url" json:"base_url"`
-	Model          string `yaml:"model" json:"model"`
-	Timeout        int    `yaml:"timeout" json:"timeout"`
-	ParseThinkTags *bool  `yaml:"parse_think_tags,omitempty" json:"parse_think_tags,omitempty"`
+	Name                string `yaml:"name" json:"name"`
+	Active              bool   `yaml:"active,omitempty" json:"active"`
+	APIKey              string `yaml:"api_key" json:"-"`
+	BaseURL             string `yaml:"base_url" json:"base_url"`
+	Model               string `yaml:"model" json:"model"`
+	Timeout             int    `yaml:"timeout" json:"timeout"`
+	ContextWindowTokens int    `yaml:"context_window_tokens" json:"context_window_tokens"`
+	ParseThinkTags      *bool  `yaml:"parse_think_tags,omitempty" json:"parse_think_tags,omitempty"`
 }
 
 type OpenAIConfigs []OpenAIConfig
@@ -87,10 +89,11 @@ type Config struct {
 
 func defaultOpenAIConfig() OpenAIConfig {
 	return OpenAIConfig{
-		Name:    "default",
-		Active:  true,
-		BaseURL: defaultOpenAIBaseURL,
-		Timeout: defaultOpenAITimeout,
+		Name:                "default",
+		Active:              true,
+		BaseURL:             defaultOpenAIBaseURL,
+		Timeout:             defaultOpenAITimeout,
+		ContextWindowTokens: defaultContextWindowTokens,
 	}
 }
 
@@ -209,6 +212,10 @@ func ensureFile(path string) error {
 	return Write(path, cfg)
 }
 
+func NormalizeOpenAIConfigs(cfg *Config) (bool, error) {
+	return normalizeOpenAIConfigs(cfg)
+}
+
 func normalizeOpenAIConfigs(cfg *Config) (bool, error) {
 	changed := false
 	if len(cfg.OpenAI) == 0 {
@@ -245,6 +252,10 @@ func normalizeOpenAIConfigs(cfg *Config) (bool, error) {
 			profile.Timeout = defaultOpenAITimeout
 			changed = true
 		}
+		if profile.ContextWindowTokens <= 0 {
+			profile.ContextWindowTokens = defaultContextWindowTokens
+			changed = true
+		}
 		if profile.Active {
 			if activeIndex == -1 {
 				activeIndex = i