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/pi/agent/settings.json

@@ -1,5 +1,5 @@
 {
-  "lastChangelogVersion": "0.80.2",
+  "lastChangelogVersion": "0.80.10",
   "theme": "light/dark",
   "defaultProvider": "opencode-go",
   "defaultModel": "deepseek-v4-flash",
@@ -8,5 +8,12 @@
   "compaction": {
     "enabled": true
   },
-  "enableInstallTelemetry": false
+  "enableInstallTelemetry": false,
+  "packages": [
+    "npm:pi-lens",
+    "npm:pi-native-search",
+    "npm:@tintinweb/pi-subagents",
+    "npm:context-mode",
+    "npm:@gotgenes/pi-permission-system"
+  ]
 }