chore: 初始提交 Fonu 1.0.2

- 公网反代：Nginx 状态卡片（版本 / 运行状态 / 配置校验 / 端口监听）
- 部署设置第一、二梯队（HTTPS 开关、安全头、限流、连接数、仅中国大陆 IP）
- 隧道检测兼容 frps v0.68 / v0.71（V2 与旧版端点）
- 恢复被清空的 internal/frp/store.go、internal/api/ddns_handler.go、web/src/views/DdnsView.vue

internal/traffic/store.go

@@ -0,0 +1,63 @@
+package traffic
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+	"time"
+)
+
+type Store struct {
+	db *sql.DB
+}
+
+func NewStore(db *sql.DB) *Store {
+	return &Store{db: db}
+}
+
+func (s *Store) LoadTotals(ctx context.Context) (map[string]hostTotals, error) {
+	rows, err := s.db.QueryContext(ctx, `SELECT host, upload_bytes, download_bytes FROM proxy_traffic`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	out := map[string]hostTotals{}
+	for rows.Next() {
+		var host string
+		var up, down int64
+		if err := rows.Scan(&host, &up, &down); err != nil {
+			return nil, err
+		}
+		key := strings.ToLower(strings.TrimSpace(host))
+		out[key] = hostTotals{Upload: up, Download: down}
+	}
+	return out, rows.Err()
+}
+
+func (s *Store) SaveTotals(ctx context.Context, hosts map[string]hostTotals) error {
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	for host, totals := range hosts {
+		_, err := tx.ExecContext(ctx, `
+			INSERT INTO proxy_traffic(host, upload_bytes, download_bytes, updated_at)
+			VALUES (?, ?, ?, ?)
+			ON CONFLICT(host) DO UPDATE SET
+				upload_bytes = excluded.upload_bytes,
+				download_bytes = excluded.download_bytes,
+				updated_at = excluded.updated_at
+		`, host, totals.Upload, totals.Download, time.Now().UTC().Format(time.RFC3339))
+		if err != nil {
+			_ = tx.Rollback()
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
+type hostTotals struct {
+	Upload   int64
+	Download int64
+}