Add .gitignore and clean: remove node_modules, cache, dist, and .env files

.gitignore

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+# ===========================
+# 智能星球计划 - .gitignore
+# ===========================
+
+# ----------------------
+# 敏感文件
+# ----------------------
+.env
+.env.local
+.env.*.local
+*.pem
+*.key
+*.crt
+*.log
+
+# ----------------------
+# Python
+# ----------------------
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+.venv/
+venv/
+ENV/
+env/
+.ruff_cache/
+*.db
+*.sqlite
+*.sqlite3
+
+# ----------------------
+# Node.js / Frontend
+# ----------------------
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+dist/
+dist-ssr/
+*.local
+.DS_Store
+
+# ----------------------
+# Unreal Engine
+# ----------------------
+# 编译产物
+DerivedDataCache/
+Intermediate/
+Saved/
+Script/
+*.pdb
+*.ilk
+*.obj
+*.o
+*.lib
+*.exe
+*.dll
+*.apk
+*.ipa
+
+# UE 特定目录
+*.uproject
+!*.uproject.template
+!ProjectFiles/
+/Plugins/**/Binaries/
+/Plugins/**/Intermediate/
+/Content/*.umap
+/Content/*.uasset
+/Content/*.uexp
+/Content/*.ubulk
+/Content/*.uptnl
+/Content/**/*_BuiltData.uasset
+/Content/**/*_PIE.uasset
+
+# UE 构建输出
+Build/
+Published/
+HTML5/
+Windows/
+Linux/
+Mac/
+Planet.exe
+
+# ----------------------
+# IDE
+# ----------------------
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+*.sublime-*
+
+# ----------------------
+# 测试和覆盖率
+# ----------------------
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.hypothesis/
+
+# ----------------------
+# Docker
+# ----------------------
+.docker/
+docker-compose.override.yml
+
+# ----------------------
+# 文档生成
+# ----------------------
+docs/_build/
+docs/.venv/
+
+# ----------------------
+# 临时文件
+# ----------------------
+*.tmp
+*.bak
+*.orig
+*.cache
+*.temp
+tmp/
+temp/