初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

service/backup.go

@@ -0,0 +1,52 @@
+package service
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+type BackupService struct {
+	dbPath  string
+	dataDir string
+}
+
+func NewBackupService(dbPath, dataDir string) *BackupService {
+	return &BackupService{dbPath: dbPath, dataDir: dataDir}
+}
+
+// ExportSQLite 导出 SQLite 备份文件到 data 目录
+func (s *BackupService) ExportSQLite() (string, error) {
+	src, err := os.Open(s.dbPath)
+	if err != nil {
+		return "", fmt.Errorf("打开数据库失败: %w", err)
+	}
+	defer src.Close()
+
+	filename := fmt.Sprintf("jiang13_backup_%s.db", time.Now().Format("20060102_150405"))
+	destPath := filepath.Join(s.dataDir, filename)
+	dst, err := os.Create(destPath)
+	if err != nil {
+		return "", err
+	}
+	defer dst.Close()
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return "", err
+	}
+	return destPath, nil
+}
+
+// WriteDefaultFilterWords 写入默认敏感词配置
+func WriteDefaultFilterWords(path string) error {
+	if _, err := os.Stat(path); err == nil {
+		return nil
+	}
+	content := `# 姜十三论坛敏感词配置，每行一个词，# 开头为注释
+违禁词示例
+广告刷单
+`
+	return os.WriteFile(path, []byte(content), 0644)
+}