Improve display of recordings data (#16436)

* backend

* frontend

* add earliest recording available to storage metrics page

frigate/api/defs/query/media_query_parameters.py

@@ -41,3 +41,8 @@ class MediaMjpegFeedQueryParams(BaseModel):
     mask: Optional[int] = None
     motion: Optional[int] = None
     regions: Optional[int] = None
+
+
+class MediaRecordingsSummaryQueryParams(BaseModel):
+    timezone: str = "utc"
+    cameras: Optional[str] = "all"