refactor: skills 目录扁平化，移除分类子目录

- 将 00-元技能、01-AI工具、02-数据库、03-加密货币、04-开发工具、05-生产力 下的技能移至 skills/ 根目录
- 更新 skills/README.md 使用表格进行说明性分类
- 更新 AGENTS.md 目录结构说明

skills/snapdom/references/index.md

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+# Snapdom Documentation Index
+
+## Categories
+
+### Other
+**File:** `other.md`
+**Pages:** 1

skills/snapdom/references/other.md

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+# Snapdom - Other
+
+**Pages:** 1
+
+---
+
+## snapDOM – HTML to Image capture with superior accuracy and speed - Now with Plugins!
+
+**URL:** https://snapdom.dev/
+
+**Contents:**
+- 🏁 Benchmark: snapDOM vs html2canvas
+- 📦 Basic
+  - Hello SnapDOM!
+- Transforms & Shadows
+- 🅰️ ASCII Plugin
+- 🕒 Timestamp Plugin
+- 🚀 Fun Transition
+- Orbit CSS toolkit - Go to repo
+- 🔤 Google Fonts
+  - Unique Typography!
+
+Each library will capture the same DOM element to canvas 5 times. We'll calculate average speed and show the winner.
+
+Capture it just with outerTransforms / outerShadows.
+
+I'm dancing and changing color!
+
+Google Fonts with embedFonts: true.
+
+**Examples:**
+
+Example 1 (unknown):
+```unknown
+outerTransforms
+```
+
+Example 2 (unknown):
+```unknown
+outerShadows
+```
+
+Example 3 (unknown):
+```unknown
+outerTransforms
+```
+
+Example 4 (unknown):
+```unknown
+outerShadows
+```
+
+---