Add Rec Center doors management: implement endpoints for retrieving and updating door configurations; enhance database schema and UI integration

DorkNet.Server/Startup/DatabaseBootstrap.cs

@@ -244,6 +244,8 @@ public static class DatabaseBootstrap
         {
             await db.Database.ExecuteSqlRawAsync(
                 @"ALTER TABLE ""ServerSettings"" ADD COLUMN IF NOT EXISTS ""PlayMenuTagsJson"" text NOT NULL DEFAULT '';");
+            await db.Database.ExecuteSqlRawAsync(
+                @"ALTER TABLE ""ServerSettings"" ADD COLUMN IF NOT EXISTS ""RecCenterDoorsJson"" text NOT NULL DEFAULT '';");
             return;
         }
 
@@ -258,6 +260,18 @@ public static class DatabaseBootstrap
             // ignore the duplicate-column error; any other schema problem
             // will surface when EF reads ServerSettings.
         }
+
+        try
+        {
+            await db.Database.ExecuteSqlRawAsync(
+                @"ALTER TABLE ""ServerSettings"" ADD COLUMN ""RecCenterDoorsJson"" TEXT NOT NULL DEFAULT '';");
+        }
+        catch
+        {
+            // SQLite has no ADD COLUMN IF NOT EXISTS. If it already exists,
+            // ignore the duplicate-column error; any other schema problem
+            // will surface when EF reads ServerSettings.
+        }
     }
 
     /// <summary>SQLite migration-history reconciliation. Handles two