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

fcitx5/profile

@@ -0,0 +1,23 @@
+[Groups/0]
+# Group Name
+Name=Default
+# Layout
+Default Layout=us
+# Default Input Method
+DefaultIM=rime
+
+[Groups/0/Items/0]
+# Name
+Name=keyboard-us
+# Layout
+Layout=
+
+[Groups/0/Items/1]
+# Name
+Name=rime
+# Layout
+Layout=
+
+[GroupOrder]
+0=Default
+