Add server configuration service and repo

RecNet.Infrastructure/Persistence/Configurations/ServerConfigConfiguration.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using RecNet.Domain.Entities.Configuration;
+
+namespace RecNet.Infrastructure.Persistence.Configurations;
+
+public class ServerConfigConfiguration : IEntityTypeConfiguration<ServerConfig>
+{
+    public void Configure(EntityTypeBuilder<ServerConfig> builder)
+    {
+        builder.HasKey(x => x.Key);
+
+        builder.Property(x => x.Key)
+            .HasMaxLength(128)
+            .IsRequired();
+
+        builder.Property(x => x.Value)
+            .HasColumnType("jsonb")
+            .IsRequired();
+    }
+}