refactor: Move Emacs config from system/ to projects/dotemacs/

- Delete deprecated system/ configuration files
- Update projects/dotemacs/modules/ with reorganized config
- Add .opencode/ directory for agent state
- Clean up attachments and unused documentation files

projects/dotemacs/modules/emacs-ui.el

@@ -0,0 +1,16 @@
+(when (fboundp 'tool-bar-mode) (tool-bar-mode -1))
+(when (fboundp 'menu-bar-mode) (menu-bar-mode -1))
+(when (fboundp 'scroll-bar-mode) (scroll-bar-mode -1))
+
+(setq inhibit-startup-screen t)
+(setq initial-scratch-message nil)
+
+(set-face-attribute 'default nil :family "sans-serif" :height 120)
+(set-face-attribute 'variable-pitch nil :family "sans-serif")
+
+(use-package org-modern
+  :ensure t
+  :config
+  (set-face-attribute 'org-modern-symbol nil :family "Iosevka")
+  (global-org-modern-mode)
+  )