feat: move TTS into core (#1559) (thanks @Glucksberg)

src/config/types.tts.ts

@@ -0,0 +1,30 @@
+export type TtsProvider = "elevenlabs" | "openai";
+
+export type TtsMode = "final" | "all";
+
+export type TtsConfig = {
+  /** Enable auto-TTS (can be overridden by local prefs). */
+  enabled?: boolean;
+  /** Apply TTS to final replies only or to all replies (tool/block/final). */
+  mode?: TtsMode;
+  /** Primary TTS provider (fallbacks are automatic). */
+  provider?: TtsProvider;
+  /** ElevenLabs configuration. */
+  elevenlabs?: {
+    apiKey?: string;
+    voiceId?: string;
+    modelId?: string;
+  };
+  /** OpenAI configuration. */
+  openai?: {
+    apiKey?: string;
+    model?: string;
+    voice?: string;
+  };
+  /** Optional path for local TTS user preferences JSON. */
+  prefsPath?: string;
+  /** Hard cap for text sent to TTS (chars). */
+  maxTextLength?: number;
+  /** API request timeout (ms). */
+  timeoutMs?: number;
+};