feat: initial skills collection — 20 curated skills from anthropics, obra, vercel, supabase and more

Skills added:
- AI Tools (9): pdf, docx, xlsx, pptx, skill-creator, brand-guidelines, webapp-testing, canvas-design, mcp-builder (from anthropics/skills)
- Productivity (5): brainstorming, systematic-debugging, test-driven-development, writing-plans, executing-plans (from obra/superpowers)
- Marketing (3): seo-audit, copywriting, content-strategy (from coreyhaines31/marketingskills)
- Frontend (2): vercel-react-best-practices, web-design-guidelines (from vercel-labs/agent-skills)
- Database (1): supabase-postgres-best-practices (from supabase/agent-skills)

Also reorganized openclaw-guardian into skills/openclaw-guardian/ subdirectory

CHANGELOG.md

@@ -5,6 +5,36 @@ Updated every Monday.
 
 ---
 
+## [Week 1] — 2026-03-02 (Initial Fill)
+
+### 🎉 首次批量填充 — 20 个 Skills
+
+| Skill | Description | Source |
+|---|---|---|
+| `openclaw-guardian` | 🛡️ Gateway watchdog with auto-repair & git rollback | [LeoYeAI/openclaw-guardian](https://github.com/LeoYeAI/openclaw-guardian) |
+| `pdf` | Use this skill whenever the user wants to do anything with PDF files. This inclu | [anthropics/skills](https://github.com/anthropics/skills) |
+| `docx` | Use this skill whenever the user wants to create, read, edit, or manipulate Word | [anthropics/skills](https://github.com/anthropics/skills) |
+| `xlsx` | Use this skill any time a spreadsheet file is the primary input or output. This  | [anthropics/skills](https://github.com/anthropics/skills) |
+| `pptx` | Use this skill any time a .pptx file is involved in any way — as input, output,  | [anthropics/skills](https://github.com/anthropics/skills) |
+| `skill-creator` | Create new skills, modify and improve existing skills, and measure skill perform | [anthropics/skills](https://github.com/anthropics/skills) |
+| `brand-guidelines` | Applies Anthropic's official brand colors and typography to any sort of artifact | [anthropics/skills](https://github.com/anthropics/skills) |
+| `webapp-testing` | Toolkit for interacting with and testing local web applications using Playwright | [anthropics/skills](https://github.com/anthropics/skills) |
+| `canvas-design` | Create beautiful visual art in .png and .pdf documents using design philosophy.  | [anthropics/skills](https://github.com/anthropics/skills) |
+| `mcp-builder` | Guide for creating high-quality MCP (Model Context Protocol) servers that enable | [anthropics/skills](https://github.com/anthropics/skills) |
+| `brainstorming` | You MUST use this before any creative work - creating features, building compone | [obra/superpowers](https://github.com/obra/superpowers) |
+| `systematic-debugging` | Use when encountering any bug, test failure, or unexpected behavior, before prop | [obra/superpowers](https://github.com/obra/superpowers) |
+| `test-driven-development` | Use when implementing any feature or bugfix, before writing implementation code | [obra/superpowers](https://github.com/obra/superpowers) |
+| `writing-plans` | Use when you have a spec or requirements for a multi-step task, before touching  | [obra/superpowers](https://github.com/obra/superpowers) |
+| `executing-plans` | Use when you have a written implementation plan to execute in a separate session | [obra/superpowers](https://github.com/obra/superpowers) |
+| `seo-audit` | When the user wants to audit, review, or diagnose SEO issues on their site. Also | [coreyhaines31/marketingskills](https://github.com/coreyhaines31/marketingskills) |
+| `copywriting` | When the user wants to write, rewrite, or improve marketing copy for any page —  | [coreyhaines31/marketingskills](https://github.com/coreyhaines31/marketingskills) |
+| `content-strategy` | When the user wants to plan a content strategy, decide what content to create, o | [coreyhaines31/marketingskills](https://github.com/coreyhaines31/marketingskills) |
+| `vercel-react-best-practices` | React and Next.js performance optimization guidelines from Vercel Engineering. T | [vercel-labs/agent-skills](https://github.com/vercel-labs/agent-skills) |
+| `web-design-guidelines` | Review UI code for Web Interface Guidelines compliance. Use when asked to "revie | [vercel-labs/agent-skills](https://github.com/vercel-labs/agent-skills) |
+| `supabase-postgres-best-practices` | Postgres performance optimization and best practices from Supabase. Use this ski | [supabase/agent-skills](https://github.com/supabase/agent-skills) |
+
+---
+
 ## [Week 1] — 2026-03-02
 
 ### 🎉 Initial Release