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/Repository/IBreweryRepository.cs

@@ -7,12 +7,25 @@ namespace Features.Breweries.Repository;
 /// </summary>
 public interface IBreweryRepository
 {
-    /// <summary>Retrieves a brewery post by ID, or <c>null</c> if not found.</summary>
+    /// <summary>Returns <c>null</c> if no brewery post exists with the given ID.</summary>
     Task<BreweryPost?> GetByIdAsync(Guid id);
 
     Task<IEnumerable<BreweryPost>> GetAllAsync(int? limit, int? offset);
 
-    Task UpdateAsync(BreweryPost brewery);
+    /// <summary>
+    ///     Updates a brewery post, enforcing optimistic concurrency via <paramref name="brewery" />'s
+    ///     <c>Timer</c>: the update is rejected if the row was modified since <c>Timer</c> was read.
+    ///     Returns the freshly persisted brewery, including its new <c>Timer</c>.
+    /// </summary>
+    /// <exception cref="Domain.Exceptions.NotFoundException">
+    ///     Thrown when no brewery exists with the given ID, or the given location's <c>CityId</c> does not
+    ///     exist.
+    /// </exception>
+    /// <exception cref="Domain.Exceptions.ConflictException">
+    ///     Thrown when <paramref name="brewery" />'s <c>Timer</c> no longer matches the stored row (it was
+    ///     modified by another request since it was last read).
+    /// </exception>
+    Task<BreweryPost> UpdateAsync(BreweryPost brewery);
 
     Task DeleteAsync(Guid id);