chore: add .gitignore

.gitignore

@@ -0,0 +1,58 @@
+# Dependencies
+node_modules/
+
+# Environment files
+.env
+.env.local
+.env.production
+
+# Build output
+frontend/dist/
+frontend/tsconfig.tsbuildinfo
+frontend/tsconfig.node.tsbuildinfo
+build/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Database (个人使用可保留提交，生产环境建议取消注释)
+# prisma/dev.db
+# prisma/prod.db
+
+# Test scripts
+test-*.js
+test-*.ps1
+test-*.mjs
+verify-*.cjs
+verify-*.mjs
+visual-check-*.js
+
+# Debug scripts
+debug-*.cjs
+
+# Test results
+test-results/
+test-screenshots/
+*.png
+
+# Temporary files
+*.tmp
+*.bak
+
+# Full test files (legacy)
+full-test.js
+tdd_*.js
+TEST_CASES.md