feat: initialize database schema and implement core Radius entities, EF context, and account enforcement service.

radiuscontroller/Models/RadiusEntities.cs

@@ -179,6 +179,20 @@ public class GuestProfile
     public string Status { get; set; } = "Active";
 }
 
+[Table("guest_data_usage")]
+public class GuestDataUsage
+{
+    [Key]
+    [Column("username")]
+    public string Username { get; set; } = string.Empty;
+
+    [Column("total_input_octets")]
+    public long TotalInputOctets { get; set; }
+
+    [Column("total_output_octets")]
+    public long TotalOutputOctets { get; set; }
+}
+
 [Table("admin_users")]
 public class AdminUser
 {