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.Locations/Repository/ILocationRepository.cs

@@ -0,0 +1,16 @@
+using Features.Locations.Dtos;
+
+namespace Features.Locations.Repository;
+
+/// <summary>
+///     Resolves the Country/StateProvince/City location hierarchy shared by features that attach a
+///     location to a record (e.g. brewery posts, and eventually user accounts).
+/// </summary>
+public interface ILocationRepository
+{
+    /// <summary>
+    ///     Resolves <paramref name="location" /> to a City ID, creating the Country, StateProvince,
+    ///     and/or City rows if any part of the chain doesn't exist yet.
+    /// </summary>
+    Task<Guid> GetOrCreateCityIdAsync(CityLocation location);
+}