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/hyprlock.conf

@@ -0,0 +1,5 @@
+$color = rgba(26,27,38, 1.0)
+$inner_color = rgba(26,27,38, 0.8)
+$outer_color = rgba(169,177,214, 1.0)
+$font_color = rgba(169,177,214, 1.0)
+$check_color = rgba(122,162,247, 1.0)