Migrate Breweries to a vertical slice (Features.Breweries)

Moves brewery CRUD from the Service.Breweries/Infrastructure.Repository
layered split into a single Features.Breweries project: MediatR
commands/queries replace BreweryService, and the repository moves in
alongside its own controller. Extracts Infrastructure.Sql out of
Infrastructure.Repository (just the generic ADO.NET connection/base-repo
plumbing) since Breweries no longer needs the rest of that project, while
Auth and UserAccount repos still do until their own migration.

Also fixes the API.Core and Infrastructure.Repository.Tests Dockerfiles,
which were restoring against COPY destinations that didn't match the
projects' actual relative paths (silently working only because of the
COPY . . that followed); both now restore against Core.slnx with correctly
nested paths, verified with a real docker build.

web/backend/Features/Features.Breweries/Repository/IBreweryRepository.cs

@@ -0,0 +1,43 @@
+using Domain.Entities;
+
+namespace Features.Breweries.Repository;
+
+/// <summary>
+/// Repository for CRUD operations on brewery post records.
+/// </summary>
+public interface IBreweryRepository
+{
+    /// <summary>
+    /// Retrieves a brewery post by its unique identifier.
+    /// </summary>
+    /// <param name="id">The unique identifier of the brewery post.</param>
+    /// <returns>The matching <see cref="BreweryPost"/>, or <c>null</c> if not found.</returns>
+    Task<BreweryPost?> GetByIdAsync(Guid id);
+
+    /// <summary>
+    /// Retrieves all brewery posts, optionally paginated.
+    /// </summary>
+    /// <param name="limit">The maximum number of records to return, or <c>null</c> for no limit.</param>
+    /// <param name="offset">The number of records to skip, or <c>null</c> for no offset.</param>
+    /// <returns>The collection of matching <see cref="BreweryPost"/> records.</returns>
+    Task<IEnumerable<BreweryPost>> GetAllAsync(int? limit, int? offset);
+
+    /// <summary>
+    /// Updates an existing brewery post.
+    /// </summary>
+    /// <param name="brewery">The brewery post containing updated values.</param>
+    Task UpdateAsync(BreweryPost brewery);
+
+    /// <summary>
+    /// Deletes a brewery post by its unique identifier.
+    /// </summary>
+    /// <param name="id">The unique identifier of the brewery post to delete.</param>
+    Task DeleteAsync(Guid id);
+
+    /// <summary>
+    /// Creates a new brewery post, including its location details.
+    /// </summary>
+    /// <param name="brewery">The brewery post to create. Must have a non-null <c>Location</c>.</param>
+    /// <exception cref="ArgumentException">Thrown when <paramref name="brewery"/> has no <c>Location</c>.</exception>
+    Task CreateAsync(BreweryPost brewery);
+}