docs: 初始化项目文档（PRD、AGENTS、MEMORY、README）

.gitignore

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+# Dependencies
+node_modules/
+.pnp
+.pnp.js
+
+# Build outputs
+dist/
+build/
+*.tsbuildinfo
+
+# Environment variables
+.env
+.env.local
+.env.*.local
+
+# Database
+data/
+*.db
+*.sqlite
+*.sqlite3
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Test coverage
+coverage/