feat: 重构项目以符合 Go 规范，添加 OpenAI 接口适配，优化长文本朗读功能（切割后合并）

internal/config/config.go

@@ -0,0 +1,129 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Config 包含应用程序的所有配置
+type Config struct {
+	Server ServerConfig `yaml:"server"`
+	TTS    TTSConfig    `yaml:"tts"`
+}
+
+// ServerConfig 包含HTTP服务器配置
+type ServerConfig struct {
+	Port         int    `yaml:"port"`
+	ReadTimeout  int    `yaml:"read_timeout"`  // 单位：秒
+	WriteTimeout int    `yaml:"write_timeout"` // 单位：秒
+	BasePath     string `yaml:"base_path"`
+}
+
+// TTSConfig 包含Microsoft TTS API配置
+type TTSConfig struct {
+	APIKey            string            `yaml:"api_key"`
+	Region            string            `yaml:"region"`
+	DefaultVoice      string            `yaml:"default_voice"`
+	DefaultRate       string            `yaml:"default_rate"`
+	DefaultPitch      string            `yaml:"default_pitch"`
+	DefaultFormat     string            `yaml:"default_format"`
+	MaxTextLength     int               `yaml:"max_text_length"`
+	RequestTimeout    int               `yaml:"request_timeout"` // 单位：秒
+	MaxConcurrent     int               `yaml:"max_concurrent"`
+	SegmentThreshold  int               `yaml:"segment_threshold"`
+	MinSentenceLength int               `yaml:"min_sentence_length"`
+	MaxSentenceLength int               `yaml:"max_sentence_length"`
+	VoiceMapping      map[string]string `yaml:"voice_mapping"` // OpenAI声音到Azure声音的映射
+}
+
+var (
+	config Config
+	once   sync.Once
+)
+
+// Load 从指定路径加载配置文件
+func Load(configPath string) (*Config, error) {
+	var err error
+	once.Do(func() {
+		// 设置默认配置
+		setDefaults()
+
+		// 从配置文件加载
+		if configPath != "" {
+			err = loadFromFile(configPath)
+			if err != nil {
+				err = fmt.Errorf("加载配置文件失败: %w", err)
+				return
+			}
+		}
+
+		// 从环境变量覆盖
+		overrideFromEnv()
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}
+
+// 设置默认配置值
+func setDefaults() {
+	config = Config{
+		Server: ServerConfig{
+			Port:         8080,
+			ReadTimeout:  30,
+			WriteTimeout: 30,
+			BasePath:     "",
+		},
+		TTS: TTSConfig{
+			DefaultVoice:      "zh-CN-XiaoxiaoNeural",
+			DefaultRate:       "0%",
+			DefaultPitch:      "0%",
+			DefaultFormat:     "audio-24khz-48kbitrate-mono-mp3",
+			MaxTextLength:     5000,
+			RequestTimeout:    30,
+			MaxConcurrent:     10,
+			SegmentThreshold:  500,
+			MinSentenceLength: 200,
+			MaxSentenceLength: 300,
+			VoiceMapping:      make(map[string]string),
+		},
+	}
+}
+
+// 从配置文件加载配置
+func loadFromFile(path string) error {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+
+	return yaml.Unmarshal(data, &config)
+}
+
+// 从环境变量中覆盖配置
+func overrideFromEnv() {
+	if port := os.Getenv("TTS_SERVER_PORT"); port != "" {
+		fmt.Sscanf(port, "%d", &config.Server.Port)
+	}
+
+	if apiKey := os.Getenv("TTS_API_KEY"); apiKey != "" {
+		config.TTS.APIKey = apiKey
+	}
+
+	if region := os.Getenv("TTS_API_REGION"); region != "" {
+		config.TTS.Region = region
+	}
+
+	// 可以添加更多环境变量覆盖
+}
+
+// Get 返回已加载的配置
+func Get() *Config {
+	return &config
+}