add hermes tts playback (#541)

packages/client/src/api/hermes/tts.ts

@@ -0,0 +1,34 @@
+export interface TtsOptions {
+  text: string
+  lang?: string
+}
+
+export async function generateSpeech(opts: TtsOptions): Promise<{ audio: Blob; engine: string }> {
+  const res = await fetch(
+    `${localStorage.getItem('hermes_server_url') || ''}/api/hermes/tts`,
+    {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${localStorage.getItem('hermes_api_key') || ''}`,
+      },
+      body: JSON.stringify(opts),
+    },
+  )
+
+  if (!res.ok) {
+    throw new Error(`TTS request failed: ${res.status}`)
+  }
+
+  const audio = await res.blob()
+  const engine = res.headers.get('X-TTS-Engine') || 'unknown'
+  return { audio, engine }
+}
+
+export function playAudioBlob(blob: Blob): HTMLAudioElement {
+  const url = URL.createObjectURL(blob)
+  const audio = new Audio(url)
+  audio.play()
+  audio.onended = () => URL.revokeObjectURL(url)
+  return audio
+}