Add main menu overlay, creative inventory injection, mod discovery, logging, and Wine/Proton support

- Replace dbghelp with raw_pdb library for cross-platform PDB symbol resolution
- Add main menu branding overlay via C4JRender::Present hook
- Add creative inventory item injection from mods
- Add file-based logging (LogUtil) alongside console output
- Fix mod discovery with custom AssemblyLoadContext for proper type identity
- Add file dialog for game path selection in launcher
- Add CreativeTab enum and block/item creative tab assignment
- Unify build output to single ModLoader/build directory

LegacyForge.API/Block/BlockRegistry.cs

@@ -45,6 +45,12 @@ public static class BlockRegistry
         if (numericId < 0)
             throw new InvalidOperationException($"Failed to register block '{id}'. No free IDs or invalid parameters.");
 
+        if (properties.CreativeTabValue != CreativeTab.None)
+        {
+            NativeInterop.native_add_to_creative(numericId, 1, 0, (int)properties.CreativeTabValue);
+            Logger.Debug($"Block '{id}' added to creative tab {properties.CreativeTabValue}");
+        }
+
         Logger.Debug($"Registered block '{id}' -> numeric ID {numericId}");
         return new RegisteredBlock(id, numericId);
     }