fix: treat libretro-matched roms as identified

Agent-Logs-Url: https://github.com/rommapp/romm/sessions/9cc2e55e-af48-40bd-b2e9-492b6fd6046a

Co-authored-by: gantoine <3247106+gantoine@users.noreply.github.com>

Author: Copilot

backend/models/rom.py

@@ -373,6 +373,7 @@ def is_unidentified(self) -> bool:
             and not self.flashpoint_id
             and not self.hltb_id
             and not self.gamelist_id
+            and not self.libretro_id
         )
 
     @property

backend/tests/models/test_rom.py

@@ -4,3 +4,10 @@
 def test_rom(rom: Rom):
     assert rom.fs_path == "test_platform_slug/roms"
     assert rom.full_path == "test_platform_slug/roms/test_rom.zip"
+
+
+def test_rom_with_libretro_match_is_identified(rom: Rom):
+    rom.libretro_id = "abc123"
+
+    assert rom.is_unidentified is False
+    assert rom.is_identified is True