design-systems: add 74 brand DESIGN.md files (VoltAgent/awesome-design-md)

- 74 brands: airbnb, stripe, apple, figma, linear, vercel, etc.
- 147 files: DESIGN.md + README.md per brand (~2.1 MB)
- Each DESIGN.md contains structured brand analysis (colors, typography, components)
- Updated 00-overview.md with new design-systems directory

system/glassmorphism.md

@@ -0,0 +1,29 @@
+---
+name: system/glassmorphism
+title: Glassmorphism & Glass Effects
+description: Frosted glass UI elements with blur and transparency.
+tags: [system, glass, blur, transparency, backdrop-filter]
+source: apple.com, stripe.com, raycast.com, linear.app
+---
+
+# Glassmorphism
+
+## CSS
+
+```css
+.glass-card {
+  background: rgba(255, 255, 255, 0.03);
+  backdrop-filter: blur(20px);
+  -webkit-backdrop-filter: blur(20px);
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  border-radius: 20px;
+}
+```
+
+## Anti-patterns
+
+| ❌ Плохо | ✅ Хорошо |
+|----------|-----------|
+| `backdrop-filter` без fallback | `background: rgba()` fallback |
+| `blur(2px)` — не видно | `blur(20px)` |
+| Без `-webkit-` prefix | `-webkit-backdrop-filter` |