- Implemented.

Safari/iPhone recording now uses MP4/AAC when WebM is unavailable.
WebM remains the default when supported and FFmpeg is disabled.
Added optional FFmpeg profiles: recommended M4A/AAC-LC or requested 
MP4/H.264 + AAC.
Added MIME-aware, playsinline audio playback.
Added dashboard controls under Plans & Platform → Voice Transcoding / 
FFmpeg.
Added Apache/Nginx media MIME configuration and documentation.
Core implementation: voice_transcoder.php (line 72), messages.php (line 
86), and cyberchat-app.js (line 635).

api/config.php

@@ -21,6 +21,8 @@ jsonResponse([
         'max_duration_seconds' => $config['voice']['max_duration_seconds'] ?? 60,
         'max_upload_bytes' => $config['voice']['max_upload_bytes'] ?? 12582912,
         'auto_play_default' => $config['voice']['auto_play_default'] ?? true,
+        'transcoding_enabled' => $config['voice']['transcoding']['enabled'] ?? false,
+        'output_profile' => $config['voice']['transcoding']['profile'] ?? 'm4a_aac',
     ],
     'subscriptions' => ['enabled' => $config['subscriptions']['enabled'] ?? true],
 ]);