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/hyprland.lua

@@ -0,0 +1,14 @@
+hl.config({
+    general = {
+        col = {
+            active_border = { colors = {"rgb(7aa2f7)", "rgb(f7768e)" }, angle = 45 },
+            inactive_border = { colors = {"rgb(9ece6a)", "rgb(9ece6a)" }, angle = 45 }
+        }
+    },
+    group = {
+        col = {
+            border_active = { colors = {"rgb(7aa2f7)", "rgb(f7768e)" }, angle = 45 },
+            border_inactive = { colors = {"rgb(9ece6a)", "rgb(9ece6a)" }, angle = 45 }
+        }
+    }
+})