feat: 闲言APP v0.9.1 — 编辑器全面重写 + 迷你编辑器

- 标准编辑器: freezed数据模型 + 5Tab工具栏 + 多图层管理 + 文字增强 + 背景系统 + 导出链路
- 迷你编辑器: 极简6项功能(文字/字号/颜色/背景/预览/导出) + 三种调用方式(全屏/半屏/内嵌)
- 共享组件: GlassSlider/ColorPicker/FontPicker/TipsView
- 服务层: ExportService/ImageImportService/FontService/XycardService
- 设计系统: 统一主题令牌 + Liquid Glass风格

README.md

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+# xianyan
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.