修正资源 kind 解析边界对非字符串输入的日志

- assetKind.ts：非字符串输入不再走 `String(raw)` 字符串化，改为记录 `rawType` 并直接收口为 `unknown`。
- assetKind.test.ts：新增非字符串输入用例，钉住新的日志形状。

apps/ai-game-creator-shell/src/contracts/assetKind.ts

@@ -52,10 +52,17 @@ export function parseGameCreationAppAssetKind(
     return raw;
   }
 
-  const rawValue = typeof raw === 'string' ? raw : String(raw);
-  if (rawValue !== 'unknown') {
+  if (typeof raw !== 'string') {
+    console.warn('GameCreationApp 资源 kind 不是字符串，已收口为 unknown', {
+      rawType: typeof raw,
+      sourceContext: context,
+    });
+    return 'unknown';
+  }
+
+  if (raw !== 'unknown') {
     console.warn('未知的 GameCreationApp 资源 kind，已收口为 unknown', {
-      rawKind: rawValue,
+      rawKind: raw,
       sourceContext: context,
     });
   }

apps/ai-game-creator-shell/tests/assetKind.test.ts

@@ -25,4 +25,16 @@ describe('shell generated asset kind boundary', () => {
     );
     warn.mockRestore();
   });
+
+  it('records the input type instead of stringifying non-string input', () => {
+    const warn = vi.spyOn(console, 'warn').mockImplementation(() => undefined);
+    expect(parseGameCreationAppAssetKind(null, 'manifest.asset.kind')).toBe(
+      'unknown',
+    );
+    expect(warn).toHaveBeenCalledWith(
+      'GameCreationApp 资源 kind 不是字符串，已收口为 unknown',
+      { rawType: 'object', sourceContext: 'manifest.asset.kind' },
+    );
+    warn.mockRestore();
+  });
 });