✨(summary) enhance transcription document naming with room context

Add optional room name, recording time and date to generate better
document names based on user feedback. Template is customizable for
internationalization support.

src/backend/core/recording/event/notification.py

@@ -136,6 +136,13 @@ class NotificationService:
             "filename": recording.key,
             "email": owner_access.user.email,
             "sub": owner_access.user.sub,
+            "room": recording.room.name,
+            "recording_date": recording.created_at.astimezone(
+                owner_access.user.timezone
+            ).strftime("%Y-%m-%d"),
+            "recording_time": recording.created_at.astimezone(
+                owner_access.user.timezone
+            ).strftime("%H:%M"),
         }
 
         headers = {