Add sub stream recording with adaptive quality playback (#24009)

* add sub stream recording with adaptive quality playback

Optionally record a second, lower bitrate stream alongside the main
recording stream via a `record_sub` input role and `record.sub` config block, with its own retention windows.
Recordings rows now carry the stream type plus the media details needed to serve both streams from one manifest: video codec, audio presence, audio codec and rate, and a record-time keyframe index.

Playback resolves coverage across both streams and merges them into a single VOD sequence, falling back to a discontinuity manifest with per-clip init segments when the media signatures differ. The player exposes a quality selector, and an auto governor picks the stream from stall time, bandwidth, codec support, and the save-data hint.

* fix tests and i18n

web/public/locales/en/components/player.json

@@ -13,6 +13,20 @@
     "desc": "No frames have been received on the {{cameraName}} <code>detect</code> stream, check error logs"
   },
   "cameraOff": "Camera is off",
+  "quality": {
+    "auto": "Auto",
+    "autoLow": "Playing low quality (limited bandwidth)",
+    "autoLowCodec": "Playing low quality (Original not supported by this browser)",
+    "autoLowSaveData": "Playing low quality (data saver)",
+    "main": "Original",
+    "sub": "Low",
+    "notSupportedBrowser": "Not supported by this browser",
+    "label": "Quality",
+    "noAudio": "No audio",
+    "audioRate": "{{rate}} kHz audio",
+    "audioCodecRate": "{{codec}} {{rate}} kHz",
+    "noRecordings": "No recordings in this time range"
+  },
   "stats": {
     "streamType": {
       "title": "Stream Type:",
@@ -46,7 +60,8 @@
       "submittedFrigatePlus": "Successfully submitted frame to Frigate+"
     },
     "error": {
-      "submitFrigatePlusFailed": "Failed to submit frame to Frigate+"
+      "submitFrigatePlusFailed": "Failed to submit frame to Frigate+",
+      "playRecordingsFailed": "Failed to play recordings (error {{code}}): {{message}}"
     }
   }
 }