fix: warden mmap on macOS, add external listfile support to asset extractor

Drop PROT_EXEC from warden module mmap when using Unicorn emulation
(not needed — module image is copied into emulator address space). Use
MAP_JIT on macOS for the native fallback path.

Add --listfile option to asset_extract and SFileAddListFileEntries
support for resolving unnamed MPQ hash table entries from external
listfiles.

tools/asset_extract/extractor.hpp

@@ -26,6 +26,7 @@ public:
         bool onlyUsedDbcs = false; // Extract only the DBC files wowee uses (implies DBFilesClient/*.dbc filter)
         std::string dbcCsvOutputDir; // When set, write CSVs into this directory instead of outputDir/expansions/<exp>/db
         std::string referenceManifest; // If set, only extract files NOT in this manifest (delta extraction)
+        std::string listFile;         // External listfile for MPQ enumeration (resolves unnamed hash entries)
     };
 
     struct Stats {