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/responsive-patterns.md

@@ -0,0 +1,35 @@
+---
+name: system/responsive-patterns
+title: Responsive Design Patterns
+description: Breakpoints, mobile-first, container queries.
+tags: [system, responsive, mobile, container-queries]
+source: stripe.com, linear.app, brad.co, css-tricks.com
+---
+
+# Responsive Patterns
+
+## Breakpoints
+
+```css
+:root {
+  --breakpoint-sm: 640px;
+  --breakpoint-md: 768px;
+  --breakpoint-lg: 1024px;
+  --breakpoint-xl: 1280px;
+}
+```
+
+## Container Queries
+
+```css
+@container (min-width: 600px) {
+  .card { grid-template-columns: 1fr 1fr; }
+}
+```
+
+## Anti-patterns
+
+| ❌ Плохо | ✅ Хорошо |
+|----------|-----------|
+| 1000px breakpoint | 768px / 1024px |
+| Fixed width | `max-width: 1200px` |