- 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).

admin.php

@@ -1729,6 +1729,12 @@ td.actions{white-space:nowrap;width:1px}
                   <tr><td class="mono">voice.max_duration_seconds</td><td class="dim">integer</td><td>Maximum voice clip duration</td></tr>
                   <tr><td class="mono">voice.max_upload_bytes</td><td class="dim">integer</td><td>Maximum recording upload size</td></tr>
                   <tr><td class="mono">voice.auto_play_default</td><td class="dim">bool</td><td>Queue and play incoming clips sequentially by default</td></tr>
+                  <tr><td class="mono">voice.transcoding.enabled</td><td class="dim">bool</td><td>Use FFmpeg for uploaded voice clips</td></tr>
+                  <tr><td class="mono">voice.transcoding.ffmpeg_path</td><td class="dim">string</td><td>FFmpeg executable name or absolute path</td></tr>
+                  <tr><td class="mono">voice.transcoding.profile</td><td class="dim">string</td><td>m4a_aac or mp4_h264_aac</td></tr>
+                  <tr><td class="mono">voice.transcoding.audio_bitrate_kbps</td><td class="dim">integer</td><td>AAC output bitrate from 48 to 320 kbps</td></tr>
+                  <tr><td class="mono">voice.transcoding.timeout_seconds</td><td class="dim">integer</td><td>FFmpeg upload conversion timeout</td></tr>
+                  <tr><td class="mono">voice.transcoding.fallback_to_source</td><td class="dim">bool</td><td>Retain WebM/MP4 source when conversion fails</td></tr>
                   <tr><td class="mono">security.min_password_length</td><td class="dim">integer</td><td>Min password chars</td></tr>
                   <tr><td class="mono">security.session_timeout_hours</td><td class="dim">integer</td><td>Session expiry in hours</td></tr>
                   <tr><td class="mono">security.bcrypt_cost</td><td class="dim">integer</td><td>bcrypt work factor (10–14)</td></tr>