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/tts/microsoft/models.go

@@ -0,0 +1,45 @@
+package microsoft
+
+// MicrosoftVoice 表示Microsoft TTS服务中的一个语音
+type MicrosoftVoice struct {
+	Name            string   `json:"Name"`
+	DisplayName     string   `json:"DisplayName"`
+	LocalName       string   `json:"LocalName"`
+	ShortName       string   `json:"ShortName"`
+	Gender          string   `json:"Gender"`
+	Locale          string   `json:"Locale"`
+	LocaleName      string   `json:"LocaleName"`
+	StyleList       []string `json:"StyleList,omitempty"`
+	SampleRateHertz string   `json:"SampleRateHertz"`
+	VoiceType       string   `json:"VoiceType"`
+	Status          string   `json:"Status"`
+}
+
+// SSMLRequest 表示发送给Microsoft TTS服务的SSML请求
+type SSMLRequest struct {
+	XMLHeader string
+	Voice     string
+	Language  string
+	Rate      string
+	Pitch     string
+	Text      string
+}
+
+// FormatContentTypeMap 定义音频格式到MIME类型的映射
+var FormatContentTypeMap = map[string]string{
+	"raw-16khz-16bit-mono-pcm":         "audio/pcm",
+	"raw-8khz-8bit-mono-mulaw":         "audio/basic",
+	"riff-8khz-8bit-mono-alaw":         "audio/alaw",
+	"riff-8khz-8bit-mono-mulaw":        "audio/mulaw",
+	"riff-16khz-16bit-mono-pcm":        "audio/wav",
+	"audio-16khz-128kbitrate-mono-mp3": "audio/mp3",
+	"audio-16khz-64kbitrate-mono-mp3":  "audio/mp3",
+	"audio-16khz-32kbitrate-mono-mp3":  "audio/mp3",
+	"raw-24khz-16bit-mono-pcm":         "audio/pcm",
+	"riff-24khz-16bit-mono-pcm":        "audio/wav",
+	"audio-24khz-160kbitrate-mono-mp3": "audio/mp3",
+	"audio-24khz-96kbitrate-mono-mp3":  "audio/mp3",
+	"audio-24khz-48kbitrate-mono-mp3":  "audio/mp3",
+	"ogg-24khz-16bit-mono-opus":        "audio/ogg",
+	"webm-24khz-16bit-mono-opus":       "audio/webm",
+}