feat: Initial commit of PDF Tools project

server/.env.example

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+# 服务器配置
+PORT=3001
+NODE_ENV=development
+
+# 客户端URL
+CLIENT_URL=http://localhost:3000
+
+# 数据库配置
+MONGODB_URI=mongodb://localhost:27017/pdf-tools
+REDIS_URL=redis://localhost:6379
+
+# JWT密钥
+JWT_SECRET=your-super-secret-jwt-key-change-in-production
+JWT_EXPIRES_IN=24h
+
+# 文件存储配置
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=50MB
+ALLOWED_FILE_TYPES=pdf,doc,docx,txt,html
+
+# 转换引擎配置
+CONVERSION_TIMEOUT=300000
+MAX_CONCURRENT_CONVERSIONS=5
+
+# 缓存配置
+CACHE_TTL=3600
+REDIS_PREFIX=pdf-tools:
+
+# 邮件配置（可选）
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASS=
+
+# 系统配置
+ENABLE_ANALYTICS=false
+ENABLE_RATE_LIMITING=true
+RATE_LIMIT_WINDOW=900000
+RATE_LIMIT_MAX=100