chore: final cleanup for video monitoring

agent/internal/httpapi/preview.go

@@ -3,7 +3,10 @@ package httpapi
 import (
 	"encoding/json"
 	"net/http"
+	"os"
+	"path/filepath"
 	"strconv"
+	"strings"
 )
 
 type previewChannel struct {

docs/requirements/guide.md

@@ -59,6 +59,8 @@ uv run --with flask scripts/mock_alarm_server.py
 - 运行minio
 C:\Users\Tellme\minio\minio.exe server C:\Users\Tellme\minio\myminio --address ":9000" --console-address ":9001"
 
+用户名密码是：admin/password
+
 然后在 RK3588 上测试 token 接口：
 curl -X POST http://10.0.0.49:8080/api/getToken