Fix Naxxramas slime damage using WMO ID instead of filename parsing

[kwsantiago]

🍰 Pullrequest

Fix Naxxramas slime damage by using WMO ID instead of filename parsing. This replaces the fragile string-based detection with a proper ID check and removes the commented-out hackfix that was preventing all slime environmental damage.

Proof

• Code compiles successfully with the changes
• Changes follow the exact recommendation from issue reporter (@Wall-core)
• Fix uses the same pattern as other rootWMO-> member accesses in the codebase

Issues

• fixes [FIX] Fix naxx slime #3096

How2Test

1. Test Naxxramas slime damage:

   • Enter Naxxramas (Grobbulus room has slime)
   • Stand in green slime
   • Verify you take environmental damage (should use liquid type 21)

2. Test regular slime damage:

   • Go to any other zone with slime (e.g., certain caves)
   • Stand in slime
   • Verify you take environmental damage (should use liquid type 4)

3. Verify the WMO fix:

   • Run vmap_extractor on game files
   • Check that Stratholme_raid.wmo is detected by ID 4489, not filename
   • Renamed copies of the file should NOT get Naxx slime type

Todo / Checklist

• Replaced filename.find("Stratholme_raid") with rootWMO->RootWMOID == 4489 check
• Removed commented slime damage hackfix from Player.cpp
• Code compiles without errors
• Changes are minimal
• Needs in-game testing by reviewers