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/Features/Features.Breweries/Commands/UpdateBrewery/UpdateBreweryValidator.cs

@@ -0,0 +1,13 @@
+using FluentValidation;
+
+namespace Features.Breweries.Commands.UpdateBrewery;
+
+public class UpdateBreweryValidator : AbstractValidator<UpdateBreweryCommand>
+{
+    public UpdateBreweryValidator()
+    {
+        RuleFor(x => x.Timer)
+            .NotEmpty()
+            .WithMessage("Timer is required to detect conflicting concurrent updates.");
+    }
+}