fix(ci): resolve codecov coverage reporting and add UI package docs

- Remove overly aggressive ignore patterns in codecov.yml that filtered
  out coverage data from test directories and Editor code
- Add UI flag to codecov.yml for tracking JEngine.UI package coverage
- Add JEngine.UI package to README.md with coverage badge and features
- Add JEngine.UI package to README_zh_cn.md with Chinese translations

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Author: JasonXuDeveloper

README.md

@@ -47,11 +47,16 @@ JEngine is a Unity framework that enables **runtime hot updates** for games. Des
 |---------|------|----------|-------------|
 | **JEngine.Core** | Required | N/A | Hot update support with secure, high-performance features |
 | **JEngine.Util** | Optional | [![Util Coverage](https://codecov.io/gh/JasonXuDeveloper/JEngine/branch/master/graph/badge.svg?flag=util)](https://codecov.io/gh/JasonXuDeveloper/JEngine) | Utility classes including JAction and JObjectPool |
+| **JEngine.UI** | Optional | [![UI Coverage](https://codecov.io/gh/JasonXuDeveloper/JEngine/branch/master/graph/badge.svg?flag=ui)](https://codecov.io/gh/JasonXuDeveloper/JEngine) | UI utilities for both runtime and editor |
 
 **JEngine.Util Features:**
 - **JAction** - Zero-GC chainable async task framework with fluent API, object pooling, delays, conditions, and loops
 - **JObjectPool** - Thread-safe, lock-free generic object pooling using CAS operations
 
+**JEngine.UI Features:**
+- **MessageBox** - Zero-allocation async prompt system with UniTask integration and object pooling for runtime UI
+- **Editor UI** - Shadcn-inspired modern UI Toolkit framework with theming support and Bootstrap/Panel UI integration
+
 ### Third-Party Packages
 
 | Package | Description | Link |

README_zh_cn.md

@@ -49,11 +49,16 @@ JEngine是针对Unity开发者设计的**开箱即用**的框架，封装了强
 |------|------|--------|------|
 | **JEngine.Core** | 必需 | N/A | 支持运行时热更，附带安全且高性能的功能 |
 | **JEngine.Util** | 可选 | [![Util Coverage](https://codecov.io/gh/JasonXuDeveloper/JEngine/branch/master/graph/badge.svg?flag=util)](https://codecov.io/gh/JasonXuDeveloper/JEngine) | 工具类库，包含JAction和JObjectPool |
+| **JEngine.UI** | 可选 | [![UI Coverage](https://codecov.io/gh/JasonXuDeveloper/JEngine/branch/master/graph/badge.svg?flag=ui)](https://codecov.io/gh/JasonXuDeveloper/JEngine) | 运行时和编辑器UI工具类 |
 
 **JEngine.Util 功能:**
 - **JAction** - 零GC链式异步任务框架，提供流畅API、对象池、延迟、条件和循环功能
 - **JObjectPool** - 线程安全、无锁的通用对象池，使用CAS操作
 
+**JEngine.UI 功能:**
+- **MessageBox** - 零分配异步提示系统，支持UniTask集成和对象池，用于运行时UI
+- **编辑器UI** - 借鉴shadcn的现代化UI Toolkit框架，支持主题系统和Bootstrap/Panel UI集成
+
 ### 第三方包
 
 | 包名 | 描述 | 链接 |

codecov.yml

@@ -22,6 +22,10 @@ flag_management:
       paths:
         - UnityProject/Packages/com.jasonxudeveloper.jengine.util/
       carryforward: true
+    - name: ui
+      paths:
+        - UnityProject/Packages/com.jasonxudeveloper.jengine.ui/
+      carryforward: true
     # Add future packages here as they become testable
     # - name: another-package
     #   paths:
@@ -30,9 +34,6 @@ flag_management:
 
 # Ignore files that shouldn't affect coverage
 ignore:
-  - "**/*Tests*/**"
-  - "**/*.Tests.cs"
-  - "**/Editor/**"
   - "**/Samples/**"
   # Ignore third-party packages (not JEngine's)
   - "UnityProject/Packages/com.code-philosophy.*/**"