fix(ntfs): label the system flag independently of extensions

Co-authored-by: gensokyo-dev <342580529+gensokyo-dev@users.noreply.github.com>

src/domain/windows/ntfsMft.test.ts

@@ -247,7 +247,7 @@ describe("MFT record slots", () => {
         recordNumber: 0xfedc_ba98_7654,
         sequenceNumber: 0xabcd,
       },
-      flags: { raw: 0x0005, names: ["in-use", "extension"] },
+      flags: { raw: 0x0005, names: ["in-use", "system"] },
     });
     expect(parsed.value.metadata.extension_record_count).toBe(1);
   });

src/domain/windows/ntfsMft.ts

@@ -54,7 +54,7 @@ const FILE_RECORD_IS_DIRECTORY = 0x0002;
 const FILE_RECORD_NAMES = new Map<number, string>([
   [FILE_RECORD_IN_USE, "in-use"],
   [FILE_RECORD_IS_DIRECTORY, "directory"],
-  [0x0004, "extension"],
+  [0x0004, "system"],
   [0x0008, "view-index"],
 ]);