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>

cookies/cookies.go

@@ -0,0 +1,54 @@
+package cookies
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+type Cookier interface {
+	LoadCookies() ([]byte, error)
+	SaveCookies(data []byte) error
+}
+
+type localCookie struct {
+	path string
+}
+
+func NewLoadCookie(path string) Cookier {
+	if path == "" {
+		panic("path is required")
+	}
+
+	if err := os.MkdirAll(filepath.Dir(path), 0644); err != nil {
+		panic(err)
+	}
+
+	return &localCookie{
+		path: path,
+	}
+}
+
+// LoadCookies 从文件中加载 cookies。
+func (c *localCookie) LoadCookies() ([]byte, error) {
+
+	data, err := os.ReadFile(c.path)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to read cookies from tmp file")
+	}
+
+	return data, nil
+}
+
+// SaveCookies 保存 cookies 到文件中。
+func (c *localCookie) SaveCookies(data []byte) error {
+	return os.WriteFile(c.path, data, 0644)
+}
+
+// GetCookiesFilePath 获取 cookies 文件路径。
+func GetCookiesFilePath() string {
+	tmpDir := os.TempDir()
+	filePath := filepath.Join(tmpDir, "cookies.json")
+	return filePath
+}