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

kitty/dank-theme.conf

@@ -0,0 +1,25 @@
+cursor #e0e2e8
+cursor_text_color #c2c7cf
+
+foreground            #e0e2e8
+background            #101418
+selection_foreground  #000000
+selection_background  #8ab4f8
+url_color             #42a5f5
+
+color0   #101418
+color1   #ff3270
+color2   #42f558
+color3   #fff332
+color4   #1c8de8
+color5   #003e71
+color6   #42a5f5
+color7   #e8f4ff
+color8   #8d979f
+color9   #ff739e
+color10  #7cff8d
+color11  #fff77c
+color12  #60b8ff
+color13  #7cc4ff
+color14  #abd9ff
+color15  #f5faff