fix(minimax): correct API payload and add TTS debug logging

- Fix model name: speech-2.8-hd -> speech-02-hd
- Fix bitrate: 128 -> 128000 bps
- Add channel, speed, pitch, vol to voice/audio settings
- Handle binary audio response (Content-Type: audio/*)
- Fallback audio field lookup: data.data.audio || data.audio
- Add background job log: ttsProvider + hasMinimaxKey
- Log full FFmpeg request body (text truncated, key masked)

server/routes/reels.ts

@@ -614,9 +614,13 @@ async function processReelBackground(
             const minimaxCfg = await storage.getMinimaxConfig(userId);
             if (minimaxCfg?.apiKey) {
                 minimaxApiKeyBg = minimaxCfg.apiKey;
+            } else {
+                console.error('❌ [Background] Minimax API key not found in DB for user:', userId);
             }
         }
 
+        console.log('🔊 [Background] TTS config:', { ttsEnabled, ttsProvider, ttsVoice, hasMinimaxKey: !!minimaxApiKeyBg });
+
         const ffmpegResult = await ffmpegService.processReelFromUrl(resolveInternalUrl(media.originalUrl), {
             text: overlayText,
             musicUrl: finalMusicUrl,

server/services/ffmpeg.ts

@@ -229,7 +229,9 @@ export class FFmpegService {
             drawText: options.drawText,
         });
 
-        console.log('📤 Sending to FFmpeg API:', JSON.stringify(requestBody, null, 2).substring(0, 500) + '...');
+        const debugBody = { ...requestBody };
+        if (debugBody.minimax_api_key) debugBody.minimax_api_key = '***';
+        console.log('📤 Sending to FFmpeg API:', JSON.stringify({ ...debugBody, text: debugBody.text ? `[${debugBody.text.length} chars]` : undefined }));
 
         try {
             const response = await fetch(`${config.apiUrl}/process-reel`, {