fix: 简化CI配置并修复codecov忽略规则

- 简化覆盖率生成步骤，移除复杂验证
- 修复codecov.yml中的ignore规则，移除**/*.json
- 确保coverage.json文件能被正确处理

Author: conisng

.github/workflows/ci.yml

@@ -25,21 +25,10 @@ jobs:
     
     - name: Generate Coverage Report
       run: |
-        # 清理之前的覆盖率文件
         moon coverage clean
-        # 运行MoonBit测试并生成覆盖率
         moon coverage analyze
-        # 生成Codecov兼容的coverage报告
         moon coverage report -f coveralls -o coverage.json
-        # 验证文件生成
-        if [ -f "coverage.json" ]; then
-          echo "✅ Coverage report generated successfully"
-          echo "File size: $(wc -c < coverage.json) bytes"
-          head -5 coverage.json
-        else
-          echo "❌ coverage.json not found"
-          exit 1
-        fi
+        ls -la coverage.json
     
     - name: Upload Coverage to Codecov
       uses: codecov/codecov-action@v4

README.md

@@ -1,6 +1,6 @@
 # ReactiveX for MoonBit
 
-[![codecov](https://codecov.io/gh/CGaaaaaa/ReactiveX/branch/main/graph/badge.svg?token=YOUR_TOKEN)](https://codecov.io/gh/CGaaaaaa/ReactiveX)
+[![codecov](https://codecov.io/gh/CGaaaaaa/ReactiveX/branch/main/graph/badge.svg)](https://codecov.io/gh/CGaaaaaa/ReactiveX)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Tests Passing](https://img.shields.io/badge/Tests-Passing-brightgreen.svg)](src/test.mbt)
 

codecov.yml

@@ -24,10 +24,7 @@ comment:
   require_base: no
   require_head: yes
 
-
-
 ignore:
   - "node_modules"
   - "target"
-  - "_coverage"
-  - "**/*.json"
+  - "_coverage"