docs: 初始化项目结构并添加陪玩小程序系统开发设计文档

.gitignore

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+# Dependencies
+node_modules/
+.pnpm-store/
+
+# Build outputs
+dist/
+build/
+unpackage/
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+pnpm-debug.log*
+
+# Editor & OS
+.DS_Store
+Thumbs.db
+.vscode/
+.idea/
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?