🚧(frontend) draft audio-only room recording method

(roomId is wrongly named, and designates room’s slug)

Room’s slug are passed in filenames to simplify post-processing. Thus, from filename,
we can retrieve the room being recorded.

Current limitation: audio tracks are mixed, requiring diarization.
Future plans include full audio + video recording for a more complete meeting experience.

src/frontend/src/features/rooms/livekit/api/recordRoom.ts

@@ -0,0 +1,39 @@
+import { fetchServerApi } from './fetchServerApi'
+import { buildServerApiUrl } from './buildServerApiUrl'
+import { useRoomData } from '../hooks/useRoomData'
+import { useParams } from 'wouter'
+
+export const useRecordRoom = () => {
+  const data = useRoomData()
+  const { roomId: roomSlug } = useParams()
+
+  const recordRoom = () => {
+    if (!data || !data?.livekit) {
+      throw new Error('Room data is not available')
+    }
+    if (!roomSlug) {
+      throw new Error('Room ID is not available')
+    }
+    return fetchServerApi(
+      buildServerApiUrl(
+        data.livekit.url,
+        '/twirp/livekit.Egress/StartRoomCompositeEgress'
+      ),
+      data.livekit.token,
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          room_name: data.livekit.room,
+          audio_only: true,
+          file_outputs: [
+            {
+              file_extension: 'ogg',
+              filepath: `{room_name}_{time}_${roomSlug}`,
+            },
+          ],
+        }),
+      }
+    )
+  }
+  return { recordRoom }
+}