chore: 更新 .gitignore - 排除诊断文档和临时脚本

新增忽略规则：
- 诊断文档: *诊断*.md, *分析*.md, *报告*.md
- 临时脚本: *修复*.sh, *patch*.py

目的：防止临时调试文件和诊断文档被误提交

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -54,3 +54,10 @@ data/
 captures/
 /logs/
 /tests/
+
+# Diagnostic documents and scripts - DO NOT COMMIT
+*诊断*.md
+*分析*.md
+*报告*.md
+*修复*.sh
+*patch*.py