fix(migration): add [Migration] attribute so EF discovers AddCafeLocation

Manual migration was missing the [Migration("...")] and [DbContext] attributes
that EF Core requires to discover and apply migrations via MigrateAsync().
Without them the Latitude/Longitude columns were never added to Cafes, causing
every query involving the Cafe entity to throw 42703 column-not-found errors.

Columns must be applied manually on the server before the next deploy:
  ALTER TABLE "Cafes" ADD COLUMN IF NOT EXISTS "Latitude" double precision, ...

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Meezi.Infrastructure/Data/Migrations/20260601120000_AddCafeLocation.cs

@@ -1,10 +1,14 @@
+using Meezi.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
 
 namespace Meezi.Infrastructure.Data.Migrations
 {
-    /// <inheritdoc />
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260601120000_AddCafeLocation")]
     public partial class AddCafeLocation : Migration
     {
         /// <inheritdoc />