chore: initialize tuhui repository

.gitignore

@@ -0,0 +1,30 @@
+# frontend
+frontend/node_modules/
+frontend/dist/
+frontend/playwright-report/
+frontend/.vite/
+frontend/.cache/
+
+# backend
+backend/.env
+backend/__pycache__/
+backend/app/__pycache__/
+backend/*.db
+backend/uploads/
+backend/.pytest_cache/
+backend/.mypy_cache/
+backend/.ruff_cache/
+
+# runtime data
+uploads/
+*.log
+*.pid
+
+# local/editor
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db
+
+# legacy/backup project not in active deployment
+nitu/