refactor: migrate from shell-based sync to mise dotfiles management

- Replace sync-config/sync-script with mise.toml [dotfiles] directives
- Convert installer scripts to mise tasks (shells, desktop, theme, webapps)
- Remove config/nvim-old (deprecated neovim config)
- Add omarchy theme system with multi-app configs (btop, hyprland, kitty, foot, tmux, etc.)
- Move SSH hosts to config.d/* include pattern
- Add Tera templates for dynamic config generation (git-local, dofiles.conf)
- Update pi agent settings (0.80.10, packages list)
- Add mise tasks for pi plugin setup and nvim tooling

config/omarchy/default/colors.toml

@@ -0,0 +1,23 @@
+accent = "#7aa2f7"
+cursor = "#c0caf5"
+foreground = "#a9b1d6"
+background = "#1a1b26"
+selection_foreground = "#c0caf5"
+selection_background = "#7aa2f7"
+
+color0 = "#32344a"
+color1 = "#f7768e"
+color2 = "#9ece6a"
+color3 = "#e0af68"
+color4 = "#7aa2f7"
+color5 = "#ad8ee6"
+color6 = "#449dab"
+color7 = "#787c99"
+color8 = "#444b6a"
+color9 = "#ff7a93"
+color10 = "#b9f27c"
+color11 = "#ff9e64"
+color12 = "#7da6ff"
+color13 = "#bb9af7"
+color14 = "#0db9d7"
+color15 = "#acb0d0"