Added support for openai api tts.

public/js/kokoro-handler.js

@@ -29,7 +29,6 @@ export class KokoroHandler extends TTSHandler {
         this.iframe = null;
         this.currentAudio = null;
         this.currentVoice = null;
-        this.preloadCache = new Map();
         this.pendingGenerations = new Map();
         this.generationCounter = 0;
         
@@ -501,18 +500,11 @@ export class KokoroHandler extends TTSHandler {
         }
         
         try {
-            // Check if already in cache
-            const cacheKey = `${this.currentVoice?.id || 'af_heart'}-${this.options.rate}-${text}`;
-            if (this.preloadCache.has(cacheKey)) {
-                return this.preloadCache.get(cacheKey);
-            }
-            
-            // Generate speech
+            // No longer check the local cache as we're using TTSFactory's centralized cache
+            // Generate speech directly
             const result = await this.generateSpeech(text);
             
-            // Store in cache
-            this.preloadCache.set(cacheKey, result);
-            
+            // Return result for centralized caching in TTSFactory
             return result;
         } catch (error) {
             console.error('Kokoro TTS: Error preloading speech:', error);