Add admin-editable registration info to barrio signup page

src/Humans.Application/Interfaces/ICityPlanningService.cs

@@ -37,6 +37,7 @@ public interface ICityPlanningService
     Task UpdateOfficialZonesAsync(string geoJson, Guid userId, CancellationToken cancellationToken = default);
     Task DeleteOfficialZonesAsync(Guid userId, CancellationToken cancellationToken = default);
     Task UpdatePlacementDatesAsync(LocalDateTime? opensAt, LocalDateTime? closesAt, CancellationToken cancellationToken = default);
+    Task UpdateRegistrationInfoAsync(string? registrationInfo, CancellationToken cancellationToken = default);
 
     // Export
     Task<string> ExportAsGeoJsonAsync(int year, CancellationToken cancellationToken = default);

src/Humans.Domain/Entities/CityPlanningSettings.cs

@@ -19,6 +19,9 @@ public class CityPlanningSettings
     /// <summary>Informational scheduled close time shown in help modal. Not enforced.</summary>
     public LocalDateTime? PlacementClosesAt { get; set; }
 
+    /// <summary>Admin-editable markdown content shown at the top of the barrio registration page. Null/empty = hidden.</summary>
+    public string? RegistrationInfo { get; set; }
+
     /// <summary>GeoJSON FeatureCollection defining the visual site boundary. Null until uploaded.</summary>
     public string? LimitZoneGeoJson { get; set; }
 

src/Humans.Infrastructure/Data/Configurations/CityPlanningSettingsConfiguration.cs

@@ -12,6 +12,7 @@ public void Configure(EntityTypeBuilder<CityPlanningSettings> builder)
 
         builder.HasIndex(s => s.Year).IsUnique();
 
+        builder.Property(s => s.RegistrationInfo).HasColumnType("text");
         builder.Property(s => s.LimitZoneGeoJson).HasColumnType("text");
         builder.Property(s => s.OfficialZonesGeoJson).HasColumnType("text");
     }