chore: 移除模板示例文章并添加AGENTS.md配置

AGENTS.md

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+# Project Information for AI Agents
+
+## Build Commands
+- `pnpm dev` - Start development server
+- `pnpm build` - Build for production (includes pagefind search index)
+- `pnpm preview` - Preview production build
+
+## Code Quality
+- `pnpm lint` - Run linter (biome)
+- `pnpm format` - Format code (biome)
+- `pnpm type-check` - Type check TypeScript
+
+## Project Stack
+- Framework: Astro v5
+- Styling: Tailwind CSS
+- Package Manager: pnpm
+- Linting/Formatting: Biome
+
+## Notes
+- This is a Fuwari blog template built with Astro
+- Search functionality powered by Pagefind