feat: Import 35+ skills, merge duplicates, add openclaw installer

Major updates:
- Added 35+ new skills from awesome-opencode-skills and antigravity repos
- Merged SEO skills into seo-master
- Merged architecture skills into architecture
- Merged security skills into security-auditor and security-coder
- Merged testing skills into testing-master and testing-patterns
- Merged pentesting skills into pentesting
- Renamed website-creator to thai-frontend-dev
- Replaced skill-creator with github version
- Removed Chutes references (use MiniMax API instead)
- Added install-openclaw-skills.sh for cross-platform installation
- Updated .env.example with MiniMax API credentials

skills/brand-guidelines/SKILL.md

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+---
+name: brand-guidelines
+description: Applies OpenCode's official brand colors and typography to any sort of artifact that may benefit from having OpenCode's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.
+license: Complete terms in LICENSE.txt
+---
+
+# OpenCode Brand Styling
+
+## Overview
+
+To access OpenCode's official brand identity and style resources, use this skill.
+
+**Keywords**: branding, corporate identity, visual identity, post-processing, styling, brand colors, typography, OpenCode brand, visual formatting, visual design
+
+## Brand Guidelines
+
+### Colors
+
+**Main Colors (based on OpenCode default dark theme):**
+
+- **Primary/Dark**: System terminal background (uses "none" - adapts to terminal)
+- **Text**: System terminal foreground (uses "none" - adapts to terminal)
+- **Primary Accent**: Used for actions and highlights
+- **Secondary Accent**: Used for secondary elements
+- **Success Green**: Used for success states
+- **Error Red**: Used for error states
+- **Warning Yellow**: Used for warnings
+- **Info Blue**: Used for informational elements
+
+**Recommended Color Palette (for external artifacts):**
+
+When creating artifacts for use outside OpenCode terminal, use these colors:
+
+- **Dark Background**: `#1a1b26` or `#1e1e2e` (based on Nord/dark themes)
+- **Light Background**: `#eceff4` or `#d8dee9` (based on Nord light themes)
+- **Text (Dark)**: `#d8dee9` or `#eceff4`
+- **Text (Light)**: `#2e3440` or `#434c5e`
+- **Accent Blue**: `#81a1c1` or `#88c0d0`
+- **Accent Green**: `#a3be8c` or `#8fbcbb`
+- **Accent Purple**: `#b48ead` or `#d08770`
+- **Accent Yellow**: `#ebcb8b` or `#bf616a`
+
+### Typography
+
+- **Headings/Code**: JetBrains Mono, Fira Code, or any modern monospace font
+- **Body Text**: System sans-serif (Inter, San Francisco, or equivalent)
+- **Note**: Use monospace fonts for code, technical content, and maintain readability with system fonts for general text
+
+## Features
+
+### Smart Font Application
+
+- Applies monospace fonts to code blocks, headings (24pt and larger)
+- Applies system sans-serif fonts to body text
+- Automatically falls back to system defaults if custom fonts unavailable
+- Preserves readability across all systems
+
+### Text Styling
+
+- Code blocks and headings (14pt+): Monospace font
+- Body text: System sans-serif font
+- Smart color selection based on background (dark/light)
+- Preserves text hierarchy and formatting
+
+### Shape and Accent Colors
+
+- Non-text shapes use accent colors from palette
+- Cycles through blue, green, purple, and yellow accents
+- Maintains visual interest while staying on-brand
+- Supports both dark and light modes
+
+## Technical Details
+
+### Font Management
+
+- Uses system-installed JetBrains Mono or Fira Code when available
+- Provides automatic fallback to system monospace fonts
+- No font installation required - works with existing system fonts
+- For best results, install JetBrains Mono or Fira Code in your environment
+
+### Color Application
+
+- Uses RGB color values for precise brand matching
+- Applied via python-pptx's RGBColor class or similar
+- Maintains color fidelity across different systems
+- Supports both dark and light modes
+
+## Usage Guidelines
+
+### When to Use
+
+- Creating presentation slides, reports, or documents
+- Designing visual assets or graphics
+- Applying consistent styling across multiple artifacts
+- Creating branded materials for OpenCode-related content
+
+### Best Practices
+
+- Use monospace fonts for code and technical content
+- Apply accent colors sparingly for maximum impact
+- Ensure sufficient contrast between text and background
+- Consider dark/light mode when choosing colors
+- Test color combinations in both light and dark contexts