feat(mango): first-class MangoWM support across DMS, dankinstaller & UI tools

- Bring up Mango to parity with niri/hyprland via a native JSON-IPC w/Native MangoServic., replaces the legacy dwl/`mmsg` path and recent breaking changes
- Dankinstall: mango supported installer, config/binds templates, and packaging (Arch AUR, Fedora Terra auto-enable, Gentoo GURU)
- Window rules: Go provider + CLI + Settings GUI editor
- Keybinds + config reload on edit (mmsg dispatch reload_config)
- Misc new supported options in DMS settings

quickshell/DMSShellIPC.qml

@@ -340,6 +340,9 @@ Item {
             if (CompositorService.isDwl && DwlService.activeOutput) {
                 return DwlService.activeOutput;
             }
+            if (CompositorService.isMango && MangoService.activeOutput) {
+                return MangoService.activeOutput;
+            }
             return "";
         }