feat: 扩展配置结构，新增 Session/Heartbeat/Shutdown/STT Timeout/HTTP Client/TTS Output 配置项

backend/internal/config/config.go

@@ -11,12 +11,19 @@ import (
 
 // Config 应用配置。
 type Config struct {
-	App     AppConfig     `mapstructure:"app"`
+	App      AppConfig      `mapstructure:"app"`
-	Server  ServerConfig  `mapstructure:"server"`
+	Server   ServerConfig   `mapstructure:"server"`
-	Redis   RedisConfig   `mapstructure:"redis"`
+	Session  SessionConfig  `mapstructure:"session"`
-	AI      AIConfig      `mapstructure:"ai"`
+	Redis    RedisConfig    `mapstructure:"redis"`
-	Storage StorageConfig `mapstructure:"storage"`
+	AI       AIConfig       `mapstructure:"ai"`
-	Log     LogConfig     `mapstructure:"log"`
+	Storage  StorageConfig  `mapstructure:"storage"`
+	Log      LogConfig      `mapstructure:"log"`
+}
+
+// SessionConfig 会话管理配置。
+type SessionConfig struct {
+	TTL        int `mapstructure:"ttl"`         // 会话过期时间（分钟）
+	MaxHistory int `mapstructure:"max_history"`  // 对话历史上限（条）
 }
 
 type AppConfig struct {
@@ -25,10 +32,14 @@ type AppConfig struct {
 }
 
 type ServerConfig struct {
-	Host         string `mapstructure:"host"`
+	Host              string   `mapstructure:"host"`
-	Port         int    `mapstructure:"port"`
+	Port              int      `mapstructure:"port"`
-	ReadTimeout  int    `mapstructure:"read_timeout"`
+	ReadTimeout       int      `mapstructure:"read_timeout"`
-	WriteTimeout int    `mapstructure:"write_timeout"`
+	WriteTimeout      int      `mapstructure:"write_timeout"`
+	HeartbeatInterval int      `mapstructure:"heartbeat_interval"` // 心跳检查间隔（秒）
+	HeartbeatTimeout  int      `mapstructure:"heartbeat_timeout"`  // 心跳超时（秒）
+	ShutdownTimeout   int      `mapstructure:"shutdown_timeout"`   // 优雅关闭超时（秒）
+	AllowedOrigins    []string `mapstructure:"allowed_origins"`    // CORS 允许的来源，空表示允许所有
 }
 
 // Addr 返回 host:port 地址。
@@ -49,28 +60,34 @@ type AIConfig struct {
 }
 
 type STTConfig struct {
-	Provider string `mapstructure:"provider"`
+	Provider          string `mapstructure:"provider"`
-	APIKey   string `mapstructure:"api_key"`
+	APIKey            string `mapstructure:"api_key"`
-	Model    string `mapstructure:"model"`
+	Model             string `mapstructure:"model"`
-	Endpoint string `mapstructure:"endpoint"`
+	Endpoint          string `mapstructure:"endpoint"`
+	Timeout           int    `mapstructure:"timeout"`             // STT 超时（秒）
+	HTTPClientTimeout int    `mapstructure:"http_client_timeout"` // HTTP 客户端超时（秒）
 }
 
 type LLMConfig struct {
-	Provider string `mapstructure:"provider"`
+	Provider          string `mapstructure:"provider"`
-	APIKey   string `mapstructure:"api_key"`
+	APIKey            string `mapstructure:"api_key"`
-	Model    string `mapstructure:"model"`
+	Model             string `mapstructure:"model"`
-	Endpoint string `mapstructure:"endpoint"`
+	Endpoint          string `mapstructure:"endpoint"`
-	Timeout  int    `mapstructure:"timeout"`
+	Timeout           int    `mapstructure:"timeout"`
+	HTTPClientTimeout int    `mapstructure:"http_client_timeout"` // HTTP 客户端超时（秒）
 }
 
 type TTSConfig struct {
-	Provider string  `mapstructure:"provider"`
+	Provider          string  `mapstructure:"provider"`
-	APIKey   string  `mapstructure:"api_key"`
+	APIKey            string  `mapstructure:"api_key"`
-	Model    string  `mapstructure:"model"`
+	Model             string  `mapstructure:"model"`
-	Voice    string  `mapstructure:"voice"`
+	Voice             string  `mapstructure:"voice"`
-	Speed    float64 `mapstructure:"speed"`
+	Speed             float64 `mapstructure:"speed"`
-	Endpoint string  `mapstructure:"endpoint"`
+	Endpoint          string  `mapstructure:"endpoint"`
-	Timeout  int     `mapstructure:"timeout"`
+	Timeout           int     `mapstructure:"timeout"`
+	HTTPClientTimeout int     `mapstructure:"http_client_timeout"` // HTTP 客户端超时（秒）
+	OutputFormat      string  `mapstructure:"output_format"`       // 输出格式：mp3/wav
+	SampleRate        int     `mapstructure:"sample_rate"`         // 输出采样率
 }
 
 type StorageConfig struct {
@@ -94,25 +111,37 @@ func Load() (*Config, error) {
 
 	// 默认值
 	v.SetDefault("app.env", "dev")
+	v.SetDefault("app.version", "dev")
 	v.SetDefault("server.host", "0.0.0.0")
 	v.SetDefault("server.port", 8080)
 	v.SetDefault("server.read_timeout", 30)
 	v.SetDefault("server.write_timeout", 30)
+	v.SetDefault("server.heartbeat_interval", 30)
+	v.SetDefault("server.heartbeat_timeout", 60)
+	v.SetDefault("server.shutdown_timeout", 10)
+	v.SetDefault("session.ttl", 30)
+	v.SetDefault("session.max_history", 20)
 	v.SetDefault("redis.addr", "localhost:6379")
 	v.SetDefault("redis.db", 0)
 	v.SetDefault("ai.stt.provider", "deepgram")
 	v.SetDefault("ai.stt.model", "nova-2")
 	v.SetDefault("ai.stt.endpoint", "wss://api.deepgram.com/v1/listen")
+	v.SetDefault("ai.stt.timeout", 5)
+	v.SetDefault("ai.stt.http_client_timeout", 30)
 	v.SetDefault("ai.llm.provider", "openai")
 	v.SetDefault("ai.llm.model", "gpt-4o")
 	v.SetDefault("ai.llm.endpoint", "https://api.openai.com/v1")
 	v.SetDefault("ai.llm.timeout", 10)
+	v.SetDefault("ai.llm.http_client_timeout", 60)
 	v.SetDefault("ai.tts.provider", "openai")
 	v.SetDefault("ai.tts.model", "tts-1")
 	v.SetDefault("ai.tts.voice", "mimo_default")
 	v.SetDefault("ai.tts.speed", 1.0)
 	v.SetDefault("ai.tts.endpoint", "https://api.openai.com/v1")
 	v.SetDefault("ai.tts.timeout", 5)
+	v.SetDefault("ai.tts.http_client_timeout", 30)
+	v.SetDefault("ai.tts.output_format", "mp3")
+	v.SetDefault("ai.tts.sample_rate", 24000)
 	v.SetDefault("storage.driver", "memory")
 	v.SetDefault("log.level", "info")
 	v.SetDefault("log.format", "console")