refactor: rename Audio Room → Nest project-wide

Aligns class names, package paths, string resource keys, UI text and
intent actions with the Nests branding used by the EGG specs in
nestsClient/specs/. Mechanical rename — no behavior change.

- Folders: audiorooms/ → nests/ (5 paths across amethyst, quartz)
- 30+ class renames (AudioRoom* → Nest*, AudioRooms* → Nests*)
- String resource keys audio_room_* → nest_*
- UI strings "Audio Room"/"Audio Rooms" → "Nest"/"Nests" (incl. all locales)
- Intent extras AUDIO_ROOM_* → NEST_*
- Compose route Route.AudioRooms → Route.Nests

Spec-aligned identifiers (MeetingSpaceEvent, meetingSpaces/, the nip53*
packages) are intentionally untouched — those are NIP-53 protocol
names, not "audio room" branding.

https://claude.ai/code/session_01RDpuki4t8StSg1CZcXnV5b

nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/MoqLiteNestsSpeaker.kt

@@ -21,7 +21,7 @@
 package com.vitorpamplona.nestsclient
 
 import com.vitorpamplona.nestsclient.audio.AudioCapture
-import com.vitorpamplona.nestsclient.audio.AudioRoomMoqLiteBroadcaster
+import com.vitorpamplona.nestsclient.audio.NestMoqLiteBroadcaster
 import com.vitorpamplona.nestsclient.audio.OpusEncoder
 import com.vitorpamplona.nestsclient.moq.lite.MoqLitePublisherHandle
 import com.vitorpamplona.nestsclient.moq.lite.MoqLiteSession
@@ -76,7 +76,7 @@ class MoqLiteNestsSpeaker internal constructor(
                     throw t
                 }
             val broadcaster =
-                AudioRoomMoqLiteBroadcaster(
+                NestMoqLiteBroadcaster(
                     capture = captureFactory(),
                     encoder = encoderFactory(),
                     publisher = publisher,
@@ -139,7 +139,7 @@ class MoqLiteNestsSpeaker internal constructor(
 }
 
 internal class MoqLiteBroadcastHandle(
-    private val broadcaster: AudioRoomMoqLiteBroadcaster,
+    private val broadcaster: NestMoqLiteBroadcaster,
     private val publisher: MoqLitePublisherHandle,
     private val parent: MoqLiteNestsSpeaker,
 ) : BroadcastHandle {