feat(proxy-engine): add on-demand TTS caching for voicemail and IVR prompts

ts/sipproxy.ts

@@ -24,8 +24,6 @@ import {
   getAllBrowserDeviceIds,
   getBrowserDeviceWs,
 } from './webrtcbridge.ts';
-import { initAnnouncement } from './announcement.ts';
-import { PromptCache } from './call/prompt-cache.ts';
 import { VoiceboxManager } from './voicebox.ts';
 import {
   initProxyEngine,
@@ -170,7 +168,6 @@ for (const d of appConfig.devices) {
 // Initialize subsystems
 // ---------------------------------------------------------------------------
 
-const promptCache = new PromptCache(log);
 const voiceboxManager = new VoiceboxManager(log);
 voiceboxManager.init(appConfig.voiceboxes ?? []);
 
@@ -519,6 +516,8 @@ async function startProxyEngine(): Promise<void> {
     providers: appConfig.providers,
     devices: appConfig.devices,
     routing: appConfig.routing,
+    voiceboxes: appConfig.voiceboxes ?? [],
+    ivr: appConfig.ivr,
   });
 
   if (!configured) {
@@ -530,31 +529,8 @@ async function startProxyEngine(): Promise<void> {
   const deviceList = appConfig.devices.map((d) => d.displayName).join(', ');
   log(`proxy engine started | LAN ${appConfig.proxy.lanIp}:${appConfig.proxy.lanPort} | providers: ${providerList} | devices: ${deviceList}`);
 
-  // Generate TTS audio (WAV files on disk, played by Rust audio_player).
-  try {
-    await initAnnouncement(log);
-
-    // Pre-generate prompts.
-    await promptCache.generateBeep('voicemail-beep', 1000, 500, 8000);
-    for (const vb of appConfig.voiceboxes ?? []) {
-      if (!vb.enabled) continue;
-      const promptId = `voicemail-greeting-${vb.id}`;
-      if (vb.greetingWavPath) {
-        await promptCache.loadWavPrompt(promptId, vb.greetingWavPath);
-      } else {
-        const text = vb.greetingText || 'The person you are trying to reach is not available. Please leave a message after the tone.';
-        await promptCache.generatePrompt(promptId, text, vb.greetingVoice || 'af_bella');
-      }
-    }
-    if (appConfig.ivr?.enabled) {
-      for (const menu of appConfig.ivr.menus) {
-        await promptCache.generatePrompt(`ivr-menu-${menu.id}`, menu.promptText, menu.promptVoice || 'af_bella');
-      }
-    }
-    log(`[startup] prompts cached: ${promptCache.listIds().join(', ') || 'none'}`);
-  } catch (e) {
-    log(`[tts] init failed: ${e}`);
-  }
+  // TTS prompts (voicemail greetings, IVR menus) are generated on-demand
+  // by the Rust TTS engine when first needed. No startup pre-generation.
 }
 
 // ---------------------------------------------------------------------------
@@ -620,6 +596,8 @@ initWebUi(
         providers: fresh.providers,
         devices: fresh.devices,
         routing: fresh.routing,
+        voiceboxes: fresh.voiceboxes ?? [],
+        ivr: fresh.ivr,
       }).then((ok) => {
         if (ok) log('[config] reloaded — proxy engine reconfigured');
         else log('[config] reload failed — proxy engine rejected config');