🪲 Add super critical nop include to fix import issues.

What? Apprently without that include (which should do nothing) the
@/models import isn't resolved correctly in tests/setup.ts.

I have no idea why.
I'm pretty sure this was a typo originally, but without it, imports don't seem to work correctly.

api/tests/tsconfig.json

@@ -7,5 +7,5 @@
     },
     "types": ["node", "../vitest/globals"]
   },
-  "include": ["../src/**/*", "../tests/**/*"]
+  "include": ["../src/**/*", "../tests/**/*", ""]
 }