fix: clone resolution in common.py, move clone map to root

moved _mame_clones.json out of bios/ (was indexed by generate_db.py
as BIOS file). clone resolution now in common.py resolve_local_file
so all tools (verify, pack, cross_reference) resolve clones
transparently. removed duplicate clone code from generate_pack.py.
added error handling on os.remove in dedup.py. consistency check
now passes for Batocera/EmuDeck/Lakka/RetroArch (4/6 platforms).

scripts/generate_pack.py

@@ -100,31 +100,6 @@ def _sanitize_path(raw: str) -> str:
     return "/".join(parts)
 
 
-def _load_mame_clones(bios_dir: str) -> dict[str, str]:
-    """Load MAME clone mapping: clone_name -> canonical_name."""
-    clone_path = os.path.join(bios_dir, "_mame_clones.json")
-    if not os.path.exists(clone_path):
-        return {}
-    with open(clone_path) as f:
-        data = json.load(f)
-    # Invert: clone_name -> canonical_name
-    result = {}
-    for canonical, info in data.items():
-        for clone in info.get("clones", []):
-            result[clone] = canonical
-    return result
-
-
-_MAME_CLONE_MAP: dict[str, str] | None = None
-
-
-def _get_mame_clone_map(bios_dir: str) -> dict[str, str]:
-    global _MAME_CLONE_MAP
-    if _MAME_CLONE_MAP is None:
-        _MAME_CLONE_MAP = _load_mame_clones(bios_dir)
-    return _MAME_CLONE_MAP
-
-
 def resolve_file(file_entry: dict, db: dict, bios_dir: str,
                   zip_contents: dict | None = None,
                   dest_hint: str = "") -> tuple[str | None, str]:
@@ -145,17 +120,8 @@ def resolve_file(file_entry: dict, db: dict, bios_dir: str,
     if path:
         return path, status
 
-    # MAME clone fallback: if the file was deduped, resolve via canonical
-    name = file_entry.get("name", "")
-    clone_map = _get_mame_clone_map(bios_dir)
-    canonical = clone_map.get(name)
-    if canonical:
-        canonical_entry = {"name": canonical}
-        cpath, cstatus = resolve_local_file(canonical_entry, db, zip_contents)
-        if cpath:
-            return cpath, "mame_clone"
-
     # Last resort: large files from GitHub release assets
+    name = file_entry.get("name", "")
     sha1 = file_entry.get("sha1")
     md5_raw = file_entry.get("md5", "")
     md5_list = [m.strip().lower() for m in md5_raw.split(",") if m.strip()] if md5_raw else []