feat: add Edge TTS rate/pitch sliders to voice settings (#629)

Add speed (rate) and pitch controls for Edge TTS provider:
- Frontend: speedToEdgeRate()/hzToEdgePitch() helpers + UI sliders
- Backend: rate/pitch passthrough in OpenaiTtsRequest and controller
- i18n: add edgeRate/edgePitch keys across all 8 languages
- Rate: 0.5x-2.0x slider, Pitch: -20Hz to +20Hz slider

packages/client/src/composables/useSpeech.ts

@@ -11,6 +11,8 @@ export interface OpenaiTtsOptions {
   apiKey?: string
   model?: string
   voice?: string
+  rate?: string   // Edge TTS rate format, e.g. "+20%"
+  pitch?: string  // Edge TTS pitch format, e.g. "-8Hz"
 }
 
 export interface SpeechState {
@@ -266,6 +268,9 @@ export function useSpeech() {
       input: text,
       voice: opts.voice || 'alloy',
     }
+    // Edge TTS proxy 支持 rate/pitch 参数
+    if (opts.rate) body.rate = opts.rate
+    if (opts.pitch) body.pitch = opts.pitch
 
     const headers: Record<string, string> = {
       'Content-Type': 'application/json',

packages/client/src/composables/useVoiceSettings.ts

@@ -21,6 +21,8 @@ export interface VoiceSettingsData {
   // Edge TTS
   edgeUrl: string
   edgeVoice: string
+  edgeRate: number    // 语速倍率 0.5~2.0，1.0 = 正常
+  edgePitchHz: number // 音调偏移 Hz，-20~20，0 = 正常
 }
 
 const STORAGE_KEY = 'hermes-tts-settings-v2'
@@ -63,6 +65,8 @@ const DEFAULT: VoiceSettingsData = {
 
   edgeUrl: '',
   edgeVoice: 'zh-CN-XiaoxiaoNeural',
+  edgeRate: 1.0,
+  edgePitchHz: 0,
 }
 
 function sanitize(data: VoiceSettingsData): VoiceSettingsData {
@@ -103,11 +107,13 @@ const customApiKey = ref<string>(load().customApiKey)
 // Edge TTS
 const edgeUrl = ref<string>(load().edgeUrl)
 const edgeVoice = ref<string>(load().edgeVoice)
+const edgeRate = ref<number>(load().edgeRate)
+const edgePitchHz = ref<number>(load().edgePitchHz)
 
 // Auto-persist on change
 watch(
   [provider, webspeechVoice, openaiApiKey, openaiBaseUrl, openaiModel, openaiVoice,
-   customUrl, customApiKey, edgeUrl, edgeVoice],
+   customUrl, customApiKey, edgeUrl, edgeVoice, edgeRate, edgePitchHz],
   () => {
     localStorage.setItem(STORAGE_KEY, JSON.stringify({
       provider: provider.value,
@@ -120,6 +126,8 @@ watch(
       customApiKey: customApiKey.value,
       edgeUrl: edgeUrl.value,
       edgeVoice: edgeVoice.value,
+      edgeRate: edgeRate.value,
+      edgePitchHz: edgePitchHz.value,
     }))
   },
 )
@@ -136,6 +144,8 @@ export function useVoiceSettings() {
     customApiKey,
     edgeUrl,
     edgeVoice,
+    edgeRate,
+    edgePitchHz,
 
     setProvider(v: TtsProvider) { provider.value = v },
     setWebSpeechVoice(v: string) { webspeechVoice.value = v },
@@ -147,6 +157,8 @@ export function useVoiceSettings() {
     setCustomApiKey(v: string) { customApiKey.value = v },
     setEdgeUrl(v: string) { edgeUrl.value = v },
     setEdgeVoice(v: string) { edgeVoice.value = v },
+    setEdgeRate(v: number) { edgeRate.value = v },
+    setEdgePitchHz(v: number) { edgePitchHz.value = v },
 
     reset() {
       provider.value = DEFAULT.provider
@@ -159,6 +171,8 @@ export function useVoiceSettings() {
       customApiKey.value = DEFAULT.customApiKey
       edgeUrl.value = DEFAULT.edgeUrl
       edgeVoice.value = DEFAULT.edgeVoice
+      edgeRate.value = DEFAULT.edgeRate
+      edgePitchHz.value = DEFAULT.edgePitchHz
     },
   }
 }