- Deleted Mango.Sandbox.SignalRTestClient project and all related files from the solution.
- Switched appsettings.json connection string to use FruitBank_DEV.
- Cleaned up project references in Mango.Sandbox.EndPoints and its test project.
- Commented out all Null* plugin manager/service classes in Mango.Sandbox.EndPoints.Services.
- Add endpoints and tests for binary serialization of TestCustomerDto lists to reproduce and diagnose MessagePack interned string index errors
- Update appsettings.json to use FruitBank_PROD database
- Set AcBinarySerializerOptions in DevAdminSignalRHubSandbox
- Extend TestSignalRTags and ITestSignalREndpointServer for new endpoints
- Add TestCustomerDto class for serialization tests
- Remove obsolete low-level SignalR/HTTP endpoint test files