Replace stored-procedure repositories with Dapper-based repositories

Removes the USP_* stored procedures for Auth, Location, and Brewery
data access in favour of services built with Dapper.

Adds a new Features.Locations slice and optimistic concurrency support
for the Brewery slice.

web/backend/Domain/Domain.Entities/Entities/UserCredential.cs

@@ -8,5 +8,4 @@ public class UserCredential
     public DateTime Expiry { get; set; }
     public string Hash { get; set; } = string.Empty;
     public byte[]? Timer { get; set; }
-    public UserAccount UserAccount { get; set; } = null!;
 }