chore: 初始化项目与后端基础工程

.gitignore

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+# Node / Next.js
+node_modules/
+.next/
+out/
+dist/
+build/
+coverage/
+
+# Python / FastAPI
+venv/
+.venv/
+__pycache__/
+*.py[cod]
+*.pyo
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+htmlcov/
+
+# Environment and secrets
+.env
+.env.*
+!.env.example
+!.env.local.example
+
+# Uploads and generated files
+uploads/
+backend/uploads/
+exports/
+logs/
+*.log
+
+# Database / local runtime
+*.sqlite
+*.db
+postgres_data/
+redis_data/
+
+# IDE / OS
+.DS_Store
+.idea/
+.vscode/
+.cursor-local-assistant-v2/
+
+# Package manager
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*