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

core/internal/config/embedded/mango.conf

@@ -0,0 +1,18 @@
+# DankMaterialShell — MangoWM configuration (managed by `dms setup`)
+# Keybinds, colors, layout, outputs, cursor and window rules are pulled from the
+# ./dms fragments below. Add your own binds/rules here; they sit alongside DMS's.
+
+env=XDG_CURRENT_DESKTOP,mango
+env=XDG_SESSION_TYPE,wayland
+
+# exec_once runs only at startup. Do NOT use exec= for the shell: mango re-runs
+# every exec= on each config reload, and DMS reloads the config, which would
+# spawn a new shell on every reload.
+exec_once=dms run
+
+source=./dms/colors.conf
+source=./dms/layout.conf
+source=./dms/cursor.conf
+source=./dms/outputs.conf
+source=./dms/windowrules.conf
+source=./dms/binds.conf