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).

database.json

@@ -1,7 +1,7 @@
 {
-  "generated_at": "2026-03-24T20:29:18Z",
-  "total_files": 6734,
-  "total_size": 5288666957,
+  "generated_at": "2026-03-24T20:51:56Z",
+  "total_files": 6733,
+  "total_size": 5288644732,
   "files": {
     "520d3d1b5897800af47f92efd2444a26b7a7dead": {
       "path": "bios/3DO Company/3DO/3do_arcade_saot.bin",
@@ -67323,16 +67323,6 @@
       "crc32": "0a4e2e07",
       "adler32": "4d032232"
     },
-    "065c00ac8244d46e75448f667bbdfcf64dfc37c4": {
-      "path": "bios/_mame_clones.json",
-      "name": "_mame_clones.json",
-      "size": 22225,
-      "sha1": "065c00ac8244d46e75448f667bbdfcf64dfc37c4",
-      "md5": "178e3d546f24924ccf71160799a09bc4",
-      "sha256": "098e8ee3af19d9c290a082a03b923f25b0c333b52c689a99ac75cee69f569af3",
-      "crc32": "834c7566",
-      "adler32": "12de26b9"
-    },
     "ecfc092fe6371dbf38e238a8ba5f90785b5db52d": {
       "path": "bios/xrick/data.zip",
       "name": "data.zip",
@@ -74078,7 +74068,6 @@
       "6f68e4baf89c8ee4623c19617319184b": "cee76080884af97c20059da0eb1ca956a835f3d0",
       "2010e5b85f9e1d60685ccb3d84a17115": "c7cc306fb921754ba00794153292d533cf0765ef",
       "39e5bc84ce9aac3a2d297d8aeb2a0d05": "22bcfeb5b6c6481569b90db96aa3f4b5f06c8848",
-      "178e3d546f24924ccf71160799a09bc4": "065c00ac8244d46e75448f667bbdfcf64dfc37c4",
       "a471e64e9f69afbe59c10cc94ed1b184": "ecfc092fe6371dbf38e238a8ba5f90785b5db52d"
     },
     "by_name": {
@@ -92631,9 +92620,6 @@
       "default.sf2": [
         "22bcfeb5b6c6481569b90db96aa3f4b5f06c8848"
       ],
-      "_mame_clones.json": [
-        "065c00ac8244d46e75448f667bbdfcf64dfc37c4"
-      ],
       "data.zip": [
         "ecfc092fe6371dbf38e238a8ba5f90785b5db52d"
       ],
@@ -102100,7 +102086,6 @@
       "8419990c": "cee76080884af97c20059da0eb1ca956a835f3d0",
       "3cacb086": "c7cc306fb921754ba00794153292d533cf0765ef",
       "0a4e2e07": "22bcfeb5b6c6481569b90db96aa3f4b5f06c8848",
-      "834c7566": "065c00ac8244d46e75448f667bbdfcf64dfc37c4",
       "74b76447": "ecfc092fe6371dbf38e238a8ba5f90785b5db52d"
     },
     "by_path_suffix": {