✨(backend) add per-recording encoding config to start-recording API

Add new options to query start-start recording API. A resolution
("540p", "720p", "1080p") and a profile ("talking_heads", "text", "mixed")
are resolved to provide a width, height, fps and bitrate which
are passed on to the encoder. Using profiles allows for some flexibility
on quality if necessary without changing front facing user config.

Co-authored-by: sarthakbahal <sarthakbahal.45@gmail.com>

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to
 - ✨(frontend) add participant color gradient when camera is off #1490
 - ✨(all) allow forcing SSO display name for authenticated users
 - ➕(frontend) install vite-plugin-static-copy for MediaPipe WASM assets
+- ✨(backend) add per-recording encoding quality presets to start-recording API
 
 ### Changed
 
@@ -33,6 +34,7 @@ and this project adheres to
 - 🩹(backend) identify externally provisioned users to PostHog
 - 🐛(backend) fix info panel crash for unregistered rooms
 - ♿️(frontend) focus side panel container on open #1452
+- 💥(backend) replace recording encoding options with a profile model
 
 ## [1.23.0] - 2026-07-08