feat: 新增 account 和 plan 目录

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

account/admin/skills/theme-factory/themes/modern-minimalist.md

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+# Modern Minimalist
+
+A clean and contemporary theme with a sophisticated grayscale palette for maximum versatility.
+
+## Color Palette
+
+- **Charcoal**: `#36454f` - Primary dark color
+- **Slate Gray**: `#708090` - Medium gray for accents
+- **Light Gray**: `#d3d3d3` - Backgrounds and dividers
+- **White**: `#ffffff` - Text and clean backgrounds
+
+## Typography
+
+- **Headers**: DejaVu Sans Bold
+- **Body Text**: DejaVu Sans
+
+## Best Used For
+
+Tech presentations, architecture portfolios, design showcases, modern business proposals, data visualization.