feat: implement xiaohongshu automation with MCP server

Complete implementation of xiaohongshu (Little Red Book) automation system:

### Core Features:
- **QR Code Login**: Automated login with cookie persistence
- **Content Publishing**: Post text, images with AI-powered descriptions
- **Browser Management**: Headless Chrome automation via go-rod
- **Cookie Persistence**: Session management for login state
- **MCP Server**: Model Context Protocol integration for Claude

### Technical Components:
- go-rod browser automation with stealth mode
- MCP server for Claude Code integration
- Cookie-based session management
- Robust error handling and logging
- Cross-platform compatibility

### API Endpoints:
- Login status checking and QR code authentication
- Content publishing with image upload support
- Navigation and page interaction utilities

This provides a complete foundation for xiaohongshu automation
with proper session management and MCP integration.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

xiaohongshu/login.go

@@ -0,0 +1,57 @@
+package xiaohongshu
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-rod/rod"
+	"github.com/pkg/errors"
+)
+
+type LoginAction struct {
+	page *rod.Page
+}
+
+func NewLogin(page *rod.Page) *LoginAction {
+	return &LoginAction{page: page}
+}
+
+func (a *LoginAction) CheckLoginStatus(ctx context.Context) (bool, error) {
+	pp := a.page.Context(ctx)
+	pp.MustNavigate("https://www.xiaohongshu.com/explore").MustWaitLoad()
+
+	time.Sleep(1 * time.Second)
+
+	exists, _, err := pp.Has(`.main-container .user .link-wrapper .channel`)
+	if err != nil {
+		return false, errors.Wrap(err, "check login status failed")
+	}
+
+	if !exists {
+		return false, errors.Wrap(err, "login status element not found")
+	}
+
+	return true, nil
+}
+
+func (a *LoginAction) Login(ctx context.Context) error {
+	pp := a.page.Context(ctx)
+
+	// 导航到小红书首页，这会触发二维码弹窗
+	pp.MustNavigate("https://www.xiaohongshu.com/explore").MustWaitLoad()
+
+	// 等待一小段时间让页面完全加载
+	time.Sleep(2 * time.Second)
+
+	// 检查是否已经登录
+	if exists, _, _ := pp.Has(".main-container .user .link-wrapper .channel"); exists {
+		// 已经登录，直接返回
+		return nil
+	}
+
+	// 等待扫码成功提示或者登录完成
+	// 这里我们等待登录成功的元素出现，这样更简单可靠
+	pp.MustElement(".main-container .user .link-wrapper .channel")
+
+	return nil
+}