Fix macOS CLI build: add zlib linkage for Unix platforms

The CLI tool was missing the system zlib linkage that app.pro already had,
causing undefined symbol errors for zlib functions on macOS.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tools/cli/cli.pro

@@ -19,6 +19,11 @@ win32 {
     LIBS += -L$$PWD/../../third_party/xbox_sdk/lib -lxcompress64
 }
 
+# macOS/Linux: use system zlib
+unix {
+    LIBS += -lz
+}
+
 # Include paths
 INCLUDEPATH += \
     $$PWD/../../libs/dsl \