chore: 更新 .gitignore，添加前端相关忽略规则

.gitignore

@@ -1,2 +1,33 @@
+# Go
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+coverage.out
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Environment
+.env
+
+# Documentation
 docs/
-CLAUDE.md
+
+# Claude
+CLAUDE.md
+
+# Frontend
+frontend/node_modules/
+frontend/.next/
+frontend/out/