feat: 初始化项目配置和基础架构

- 添加项目配置文件：.vercelignore、.codex/config.toml、postcss.config.js、.prettierrc 等
- 设置构建工具链：Vite + React + TypeScript + TailwindCSS
- 添加核心组件：HeaderBar、TierRow、ItemCard、Pool
- 配置 CI/CD 和部署相关文件：vercel.json、DEPLOY.md
- 添加开发工具配置：ESLint、Prettier、EditorConfig
- 实现基础功能：拖拽排序、图片处理、状态管理

.specify/templates/agent-file-template.md

@@ -0,0 +1,28 @@
+# [PROJECT NAME] Development Guidelines
+
+Auto-generated from all feature plans. Last updated: [DATE]
+
+## Active Technologies
+
+[EXTRACTED FROM ALL PLAN.MD FILES]
+
+## Project Structure
+
+```text
+[ACTUAL STRUCTURE FROM PLANS]
+```
+
+## Commands
+
+[ONLY COMMANDS FOR ACTIVE TECHNOLOGIES]
+
+## Code Style
+
+[LANGUAGE-SPECIFIC, ONLY FOR LANGUAGES IN USE]
+
+## Recent Changes
+
+[LAST 3 FEATURES AND WHAT THEY ADDED]
+
+<!-- MANUAL ADDITIONS START -->
+<!-- MANUAL ADDITIONS END -->