[mirotalksfu] - improve nodemailer, update dep, speaker focus WIP

.env.template

@@ -160,6 +160,7 @@ EMAIL_HOST=smtp.gmail.com                         # SMTP server host
 EMAIL_PORT=587                                    # SMTP port
 EMAIL_USERNAME=your_username                      # SMTP username
 EMAIL_PASSWORD=your_password                      # SMTP password
+EMAIL_FROM=               												# Sender email address
 EMAIL_SEND_TO=sfu.mirotalk@gmail.com              # Notification recipient
 
 # Slack Integration
@@ -358,4 +359,6 @@ STATS_ID=41d26670-f275-45bb-af82-3ce91fe57756     # Stats tracking ID
 # 10. Mediasoup Configuration
 # ----------------------------------------------------
 
-MEDIASOUP_LOG_LEVEL=error                         # Mediasoup log level (debug, warn, error)
+MEDIASOUP_ROUTER_AUDIO_LEVEL_OBSERVER_ENABLED=true     # Enable audio level observer (true|false)
+MEDIASOUP_ROUTER_ACTIVE_SPEAKER_OBSERVER_ENABLED=false # Enable active speaker observer (true|false)
+MEDIASOUP_LOG_LEVEL=error                              # Mediasoup log level (debug, warn, error)