M0-M4: 推倒重来基线(基建+用户/密钥/核心代理+前端+管理后台+三协议互转)

- 后端 Go+Gin+GORM: 配置(OT_ env)/SQLite/Postgres 双驱动、用户体系(argon2id+JWT access/refresh)、
  API Key(sk- 48位, 仅存 SHA-256 哈希)
- 代理网关: /v1/chat/completions、/v1/responses、/v1/messages、/v1/models;错误按客户端协议返回
- 三协议互转(convert 包): Chat↔Messages↔Responses 请求/响应 + 流式 SSE 逐事件转换(直通优先)
- 用量计费: 异步批量记账、余额扣减、balance_logs、usage_daily 日聚合
- 管理 API: 用户/渠道 CRUD+测试+模型导入/模型定价+绑定/统计/系统配置
- 前端 Vue3+TS+Tailwind(taste-skill 设计 tokens): Landing/登录注册/控制台/管理后台,
  自建组件+Phosphor 图标+自建 SVG 趋势图, 已过 web-design-guidelines 复查
- mock 上游: OpenAI+Anthropic 双协议模拟(含流式)

Co-Authored-By: Claude <noreply@anthropic.com>

server/internal/api/admin_stats.go

@@ -0,0 +1,102 @@
+package api
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/openteam/server/internal/pkg/resp"
+	"github.com/openteam/server/internal/store"
+)
+
+// AdminStatsOverview GET /api/v1/admin/stats/overview — 运营总览。
+func (h *Handler) AdminStatsOverview(c *gin.Context) {
+	now := time.Now().UTC()
+	today := now.Format("2006-01-02")
+	month := now.Format("2006-01")
+
+	var totalUsers int64
+	h.a.DB.Model(&store.User{}).Count(&totalUsers)
+	var totalKeys int64
+	h.a.DB.Model(&store.APIKey{}).Count(&totalKeys)
+	var totalChannels int64
+	h.a.DB.Model(&store.Channel{}).Count(&totalChannels)
+	var totalModels int64
+	h.a.DB.Model(&store.Model{}).Count(&totalModels)
+
+	// 全局今日/本月汇总（跨用户）
+	var todayReq, monthReq int64
+	var todayCost, monthCost float64
+	var todayTokens, monthTokens int64
+	h.a.DB.Model(&store.UsageDaily{}).Where("date = ?", today).
+		Select("COALESCE(SUM(requests),0), COALESCE(SUM(cost),0), COALESCE(SUM(input_tokens+output_tokens+cache_read_tokens),0)").
+		Row().Scan(&todayReq, &todayCost, &todayTokens)
+	h.a.DB.Model(&store.UsageDaily{}).Where("date LIKE ?", month+"%").
+		Select("COALESCE(SUM(requests),0), COALESCE(SUM(cost),0), COALESCE(SUM(input_tokens+output_tokens+cache_read_tokens),0)").
+		Row().Scan(&monthReq, &monthCost, &monthTokens)
+
+	// 近 14 天趋势（日粒度）
+	var days []struct {
+		Date string
+		Req  int64
+		Cost float64
+	}
+	h.a.DB.Model(&store.UsageDaily{}).
+		Select("date, SUM(requests) req, SUM(cost) cost").
+		Where("date >= ?", now.AddDate(0, 0, -13).Format("2006-01-02")).
+		Group("date").Order("date").Scan(&days)
+	trend := make([]gin.H, 0, len(days))
+	for _, d := range days {
+		trend = append(trend, gin.H{"date": d.Date, "requests": d.Req, "cost": d.Cost})
+	}
+
+	resp.OK(c, gin.H{
+		"total_users": totalUsers, "total_keys": totalKeys,
+		"total_channels": totalChannels, "total_models": totalModels,
+		"today":    gin.H{"requests": todayReq, "cost": todayCost, "tokens": todayTokens},
+		"month":    gin.H{"requests": monthReq, "cost": monthCost, "tokens": monthTokens},
+		"trend_14d": trend,
+	})
+}
+
+// AdminUsage GET /api/v1/admin/usage — 全局用量日志（分页 + 过滤）。
+func (h *Handler) AdminUsage(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	size, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	if page < 1 {
+		page = 1
+	}
+	if size < 1 || size > 100 {
+		size = 20
+	}
+	q := h.a.DB.Model(&store.UsageLog{})
+	if from := c.Query("from"); from != "" {
+		q = q.Where("created_at >= ?", from+" 00:00:00")
+	}
+	if to := c.Query("to"); to != "" {
+		q = q.Where("created_at <= ?", to+" 23:59:59")
+	}
+	if model := c.Query("model"); model != "" {
+		q = q.Where("model_name = ?", model)
+	}
+	if user := c.Query("user_id"); user != "" {
+		q = q.Where("user_id = ?", user)
+	}
+	var total int64
+	q.Count(&total)
+	var logs []store.UsageLog
+	q.Order("id DESC").Offset((page - 1) * size).Limit(size).Find(&logs)
+	out := make([]gin.H, 0, len(logs))
+	for _, l := range logs {
+		var uname string
+		h.a.DB.Model(&store.User{}).Where("id = ?", l.UserID).Pluck("username", &uname)
+		out = append(out, gin.H{
+			"id": l.ID, "user": uname, "user_id": l.UserID, "model": l.ModelName, "protocol": l.Protocol,
+			"input_tokens": l.InputTokens, "output_tokens": l.OutputTokens,
+			"cache_read_tokens": l.CacheReadTokens, "cost": l.Cost,
+			"latency_ms": l.LatencyMS, "status": l.Status, "error_code": l.ErrorCode,
+			"created_at": l.CreatedAt,
+		})
+	}
+	resp.OK(c, gin.H{"items": out, "total": total, "page": page, "page_size": size})
+}