refactor(config): extract resolve domain modules and seam tests

src/config/resolve/jellyfin.test.ts

@@ -0,0 +1,16 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createResolveContext } from './context';
+import { applyIntegrationConfig } from './integrations';
+
+test('jellyfin directPlayContainers are normalized', () => {
+  const { context } = createResolveContext({
+    jellyfin: {
+      directPlayContainers: [' MKV ', 'mp4', '', ' WebM  ', 42 as unknown as string],
+    },
+  });
+
+  applyIntegrationConfig(context);
+
+  assert.deepEqual(context.resolved.jellyfin.directPlayContainers, ['mkv', 'mp4', 'webm']);
+});