feat: 数据概览简化 + 用户管理增加余额/提现列

- 数据概览：去掉代付统计独立卡片，总收入中以小标签显示代付金额
- 数据概览：移除余额统计区块（余额改在用户管理中展示）
- 数据概览：恢复转化率卡片（唯一付费用户/总用户）
- 用户管理：用户列表新增「余额/提现」列，显示钱包余额和已提现金额
- 后端：DBUsersList 增加 user_balances 查询，返回 walletBalance 字段
- 后端：User model 添加 WalletBalance 非数据库字段
- 包含之前的小程序埋点和管理后台点击统计面板

Made-with: Cursor

soul-api/internal/handler/oss.go

@@ -0,0 +1,137 @@
+package handler
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"strings"
+	"time"
+
+	"github.com/aliyun/aliyun-oss-go-sdk/oss"
+
+	"soul-api/internal/database"
+	"soul-api/internal/model"
+)
+
+type ossConfigCache struct {
+	Endpoint        string `json:"endpoint"`
+	AccessKeyID     string `json:"accessKeyId"`
+	AccessKeySecret string `json:"accessKeySecret"`
+	Bucket          string `json:"bucket"`
+	Region          string `json:"region"`
+}
+
+func getOssConfig() *ossConfigCache {
+	db := database.DB()
+	var row model.SystemConfig
+	if err := db.Where("config_key = ?", "oss_config").First(&row).Error; err != nil {
+		return nil
+	}
+	var cfg ossConfigCache
+	if err := json.Unmarshal(row.ConfigValue, &cfg); err != nil {
+		return nil
+	}
+	if cfg.Endpoint == "" || cfg.AccessKeyID == "" || cfg.AccessKeySecret == "" || cfg.Bucket == "" {
+		return nil
+	}
+	return &cfg
+}
+
+func ossUploadFile(file multipart.File, folder, filename string) (string, error) {
+	cfg := getOssConfig()
+	if cfg == nil {
+		return "", fmt.Errorf("OSS 未配置")
+	}
+
+	endpoint := cfg.Endpoint
+	if !strings.HasPrefix(endpoint, "http://") && !strings.HasPrefix(endpoint, "https://") {
+		endpoint = "https://" + endpoint
+	}
+
+	client, err := oss.New(endpoint, cfg.AccessKeyID, cfg.AccessKeySecret)
+	if err != nil {
+		return "", fmt.Errorf("创建 OSS 客户端失败: %w", err)
+	}
+
+	bucket, err := client.Bucket(cfg.Bucket)
+	if err != nil {
+		return "", fmt.Errorf("获取 Bucket 失败: %w", err)
+	}
+
+	objectKey := fmt.Sprintf("%s/%s/%s", folder, time.Now().Format("2006-01"), filename)
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		return "", fmt.Errorf("读取文件失败: %w", err)
+	}
+
+	err = bucket.PutObject(objectKey, strings.NewReader(string(data)))
+	if err != nil {
+		return "", fmt.Errorf("上传 OSS 失败: %w", err)
+	}
+
+	signedURL, err := bucket.SignURL(objectKey, oss.HTTPGet, 3600*24*365*10)
+	if err != nil {
+		host := cfg.Bucket + "." + cfg.Endpoint
+		if !strings.HasPrefix(cfg.Endpoint, "http://") && !strings.HasPrefix(cfg.Endpoint, "https://") {
+			host = cfg.Bucket + "." + cfg.Endpoint
+		} else {
+			host = strings.Replace(cfg.Endpoint, "://", "://"+cfg.Bucket+".", 1)
+		}
+		if !strings.HasPrefix(host, "http://") && !strings.HasPrefix(host, "https://") {
+			host = "https://" + host
+		}
+		return host + "/" + objectKey, nil
+	}
+	return signedURL, nil
+}
+
+func ossUploadBytes(data []byte, folder, filename, contentType string) (string, error) {
+	cfg := getOssConfig()
+	if cfg == nil {
+		return "", fmt.Errorf("OSS 未配置")
+	}
+
+	endpoint := cfg.Endpoint
+	if !strings.HasPrefix(endpoint, "http://") && !strings.HasPrefix(endpoint, "https://") {
+		endpoint = "https://" + endpoint
+	}
+
+	client, err := oss.New(endpoint, cfg.AccessKeyID, cfg.AccessKeySecret)
+	if err != nil {
+		return "", fmt.Errorf("创建 OSS 客户端失败: %w", err)
+	}
+
+	bucket, err := client.Bucket(cfg.Bucket)
+	if err != nil {
+		return "", fmt.Errorf("获取 Bucket 失败: %w", err)
+	}
+
+	objectKey := fmt.Sprintf("%s/%s/%s", folder, time.Now().Format("2006-01"), filename)
+
+	var opts []oss.Option
+	if contentType != "" {
+		opts = append(opts, oss.ContentType(contentType))
+	}
+
+	err = bucket.PutObject(objectKey, strings.NewReader(string(data)), opts...)
+	if err != nil {
+		return "", fmt.Errorf("上传 OSS 失败: %w", err)
+	}
+
+	signedURL, err := bucket.SignURL(objectKey, oss.HTTPGet, 3600*24*365*10)
+	if err != nil {
+		host := cfg.Bucket + "." + cfg.Endpoint
+		if !strings.HasPrefix(cfg.Endpoint, "http://") && !strings.HasPrefix(cfg.Endpoint, "https://") {
+			host = cfg.Bucket + "." + cfg.Endpoint
+		} else {
+			host = strings.Replace(cfg.Endpoint, "://", "://"+cfg.Bucket+".", 1)
+		}
+		if !strings.HasPrefix(host, "http://") && !strings.HasPrefix(host, "https://") {
+			host = "https://" + host
+		}
+		return host + "/" + objectKey, nil
+	}
+	return signedURL, nil
+}