Seeding reorg

SVSim.Database/Services/IGameConfigService.cs

@@ -0,0 +1,21 @@
+namespace SVSim.Database.Services;
+
+/// <summary>
+/// Read-only access to game-domain configuration. Resolves each section atomically through the
+/// tier chain: DB row in <c>GameConfigs</c> → <c>appsettings.json</c> section
+/// <c>"GameConfig:&lt;SectionName&gt;"</c> → <c>T.ShippedDefaults()</c> → <c>new T()</c>.
+/// <para>
+/// "Atomic" means: the first tier that has the section wins entirely; tiers are not merged
+/// per-property. This is deliberate — see 2026-05-24 config refactor discussion. Caching is
+/// not implemented today (scoped lifetime; one DB read per request); the interface is shaped
+/// to allow it to be added later without changing call sites.
+/// </para>
+/// </summary>
+public interface IGameConfigService
+{
+    /// <summary>
+    /// Resolves the section identified by <typeparamref name="T"/>'s
+    /// <c>ConfigSectionAttribute</c>. Throws if the type is not annotated.
+    /// </summary>
+    T Get<T>() where T : class, new();
+}