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/UpdateBreweryCommand.cs

@@ -14,10 +14,13 @@ public record UpdateBreweryLocation(
 
 /// <summary>
 ///     Updates an existing brewery post. Bound directly from the request body of <c>PUT /api/brewery/{id}</c>.
-///     A <c>null</c> <see cref="Location" /> clears the brewery's location.
+///     A <c>null</c> <see cref="Location" /> clears the brewery's location. <see cref="Timer" /> must be the
+///     row-version last read for this brewery (e.g. from a prior <c>GET</c>); the update is rejected with a
+///     <c>409 Conflict</c> if the brewery was modified since then.
 /// </summary>
 public record UpdateBreweryCommand(
     Guid BreweryPostId,
+    byte[] Timer,
     Guid PostedById,
     string BreweryName,
     string Description,