Rename dataassets→customassets, Markers→WorldMarkers, prefix all mutexes

- dataassets module renamed to customassets everywhere (build flag,
  source, DLL variant name, docs)
- Markers addon renamed to WorldMarkers (addon path, .toc, .lua,
  Bindings.xml header, Lua globals, debug log prefix, mutex name)
- All 9 module mutexes now use WeirdUtils_ prefix to avoid
  collisions with other DLLs in the same process

src/interact/interact.zig

@@ -406,7 +406,7 @@ pub fn installHooks() void {
 
     // Multi-DLL safety: only one instance per process should hook
     var mutex_name_buf: [64]u8 = undefined;
-    const mutex_name = std.fmt.bufPrint(&mutex_name_buf, "Local\\InteractHook_{d}", .{GetCurrentProcessId()}) catch return;
+    const mutex_name = std.fmt.bufPrint(&mutex_name_buf, "Local\\WeirdUtils_InteractHook_{d}", .{GetCurrentProcessId()}) catch return;
     mutex_name_buf[mutex_name.len] = 0;
 
     g_mutex = CreateMutexA(null, 1, @ptrCast(mutex_name_buf[0..mutex_name.len :0]));