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/foot.ini

@@ -0,0 +1,25 @@
+[colors-dark]
+foreground=a9b1d6
+background=1a1b26
+selection-foreground=c0caf5
+selection-background=7aa2f7
+
+cursor=1a1b26 c0caf5
+
+regular0=32344a
+regular1=f7768e
+regular2=9ece6a
+regular3=e0af68
+regular4=7aa2f7
+regular5=ad8ee6
+regular6=449dab
+regular7=787c99
+
+bright0=444b6a
+bright1=ff7a93
+bright2=b9f27c
+bright3=ff9e64
+bright4=7da6ff
+bright5=bb9af7
+bright6=0db9d7
+bright7=acb0d0