feat: name the ROM folder option of QUASI88kai

-romdir replaces the ROM directory (src/getconf.cpp:282-290, 529),
and RetroPie writes -romdir $biosdir/pc88 into quasi88.ini
(scriptmodules/emulators/quasi88.sh:67). Its 19 ROMs move from rom/
to pc88/ in the RetroPie pack, manifest and verify.

emulators/quasi88kai.yml

@@ -16,6 +16,8 @@ built_by: [retropie]
 systems:
   - nec-pc-88
   - nec-pc-80
+standalone_directories:
+  - "-romdir = rom"
 
 notes: |
   Continuation of Showzoh Fukunaga's QUASI88, version 0.7.1 at the pinned

tests/test_launcher_placement.py

@@ -705,5 +705,21 @@ class AetherSX2OnKnulli(unittest.TestCase):
                 self.assertEqual(entry.get("unplaced"), "outside_bios_folder", path)
 
 
+class Quasi88OnRetroPie(unittest.TestCase):
+    """RetroPie writes -romdir $biosdir/pc88 into quasi88.ini (quasi88.sh:67)."""
+
+    def test_the_roms_land_in_pc88(self) -> None:
+        profile = load_emulator_profiles(str(REPO_ROOT / "emulators"))["quasi88kai"]
+        config = load_platform_config("retropie", str(REPO_ROOT / "platforms"))
+        (view, standalone), = platform_layouts("quasi88kai", profile, standalone_set(config))
+        self.assertTrue(standalone)
+        paths = [e["path"] for e in view["files"]]
+        self.assertTrue(paths and all(p.startswith("rom/") for p in paths))
+        self.assertEqual(
+            [e["standalone_path"] for e in view["files"]],
+            ["pc88/" + p.removeprefix("rom/") for p in paths],
+        )
+
+
 if __name__ == "__main__":
     unittest.main()