[Tracking] C#/Gateway Offload: resolve TODOs

Generated at commit 57827bc9:

• extra/admin-api/Spacebar.GatewayOffload/Controllers/ChannelStatusController.cs:52: status = statusOptions[new Random().Next(statusOptions.Length)], // TODO: We don't currently store channel statuses, so make some stuff up
• extra/admin-api/Spacebar.GatewayOffload/Controllers/ChannelStatusController.cs:53: voiceStartTime = DateTime.Now.Subtract(TimeSpan.FromMinutes(new Random().Next(1, 120))), // TODO: We also don't store voice start times, so make some stuff up
• extra/admin-api/Spacebar.GatewayOffload/Controllers/Op8Controller.cs:45: // TODO: figure out how to abstract this to a function without EFCore complaining about not being translatable...
• ``extra/admin-api/Spacebar.GatewayOffload/Controllers/Op8Controller.cs:61: // see TODO on IsOnline - somehow need to replicate `IsOnline(s)```
• extra/admin-api/Spacebar.GatewayOffload/Controllers/Op14Controller.cs:17: // TODO: actually return something?
• extra/admin-api/Spacebar.GatewayOffload/Controllers/Op14Controller.cs:49: return null; // TODO
• extra/admin-api/Spacebar.GatewayOffload/Controllers/IdentifyController.cs:45: // TODO: type? also, implement this in gateway lol
• extra/admin-api/Spacebar.GatewayOffload/Controllers/Op12Controller.cs:45: // TODO: figure out how to abstract this to a function without EFCore complaining about not being translatable...
• ``extra/admin-api/Spacebar.GatewayOffload/Controllers/Op12Controller.cs:61: // see TODO on IsOnline - somehow need to replicate `IsOnline(s)```

Start with the controllers listed under extra/admin-api/Spacebar.GatewayOffload, using the generated commit 57827bc9 to review each TODO in context. Trace the existing gateway and EF Core behavior around ChannelStatus, Op8, Op12, Op14, and Identify, then resolve every checked item and verify that the affected admin API responses behave as intended.