fix: Consider IGDB alternatives when checking for exact match

IGDB provides alternative names for games, which we are currently not
considering when checking for an exact match.

This change starts considering alternative names, in addition to the
game's name and slug, when checking for an exact match.

backend/handler/metadata/igdb_handler.py

@@ -278,13 +278,23 @@ class IGDBBaseHandler(MetadataHandler):
         )
 
         def is_exact_match(rom: dict, search_term: str) -> bool:
-            return (
-                rom["name"].lower() == search_term.lower()
-                or rom["slug"].lower() == search_term.lower()
-                or (
-                    self._normalize_exact_match(rom["name"])
-                    == self._normalize_exact_match(search_term)
+            search_term_lower = search_term.lower()
+            if rom["slug"].lower() == search_term_lower:
+                return True
+
+            search_term_normalized = self._normalize_exact_match(search_term)
+            # Check both the ROM name and alternative names for an exact match.
+            rom_names = [rom["name"]] + [
+                alternative_name["name"]
+                for alternative_name in rom.get("alternative_names", [])
+            ]
+
+            return any(
+                (
+                    rom_name.lower() == search_term_lower
+                    or self._normalize_exact_match(rom_name) == search_term_normalized
                 )
+                for rom_name in rom_names
             )
 
         roms = await self._request(