新增 niri/dms/gtk/qt/cava/fcitx5 等配置并添加 .gitignore

- 纳入版本管理: niri/(含 dms/), DankMaterialShell/, environment.d/,
  cava/, gtk-3.0/, gtk-4.0/, qt5ct/, qt6ct/, fcitx5/
- 新增 .gitignore: 排除 *.bak/*.backup*、fcitx5/conf/cached_layouts、
  DankMaterialShell 运行时标志
- 同步已有的 kitty/nvim/.zshrc 修改

niri/dms/colors.kdl

@@ -0,0 +1,39 @@
+// ! Auto-generated file. Do not edit directly.
+// Remove `include "dms/colors.kdl"` from your config to override.
+
+layout {
+    background-color "transparent"
+
+    focus-ring {
+        active-color   "#42a5f5"
+        inactive-color "#8c9199"
+        urgent-color   "#f2b8b5"
+    }
+
+    border {
+        active-color   "#42a5f5"
+        inactive-color "#8c9199"
+        urgent-color   "#f2b8b5"
+    }
+
+    shadow {
+        color "#00000070"
+    }
+
+    tab-indicator {
+        active-color   "#42a5f5"
+        inactive-color "#8c9199"
+        urgent-color   "#f2b8b5"
+    }
+
+    insert-hint {
+        color "#42a5f580"
+    }
+}
+
+recent-windows {
+    highlight {
+        active-color   "#0d47a1"
+        urgent-color   "#f2b8b5"
+    }
+}