feat: add total player count and total playtime logic

- Implemented TotalPlayerCountLogic to retrieve the total number of unique players within a specified time range.
- Implemented TotalPlayTimeLogic to calculate the total playtime of players within a specified time range.
- Created ServiceContext to manage database connections and initialize necessary tables.
- Added types for total player count and total playtime requests and responses.
- Set up the main server file to start the application with the necessary configurations.
- Updated go.mod and go.sum for new dependencies.

app/internal/logic/totalplaytimelogic.go

@@ -0,0 +1,47 @@
+package logic
+
+import (
+	"context"
+
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/svc"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/types"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type TotalPlayTimeLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+// Get total playtime within a specified time range
+func NewTotalPlayTimeLogic(ctx context.Context, svcCtx *svc.ServiceContext) *TotalPlayTimeLogic {
+	return &TotalPlayTimeLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *TotalPlayTimeLogic) TotalPlayTime(req *types.TotalPlayTimeReq) (resp *types.TotalPlayTimeResp, err error) {
+	query := `
+		SELECT COALESCE(SUM(duration), 0)
+		FROM steam_union.connection_log
+		WHERE connection_type = 2
+			AND log_time >= TO_TIMESTAMP($1 / 1000.0)
+			AND log_time <= TO_TIMESTAMP($2 / 1000.0)
+			AND steamid64 > 1
+	`
+
+	var totalTime int64
+	err = l.svcCtx.DB.QueryRowContext(l.ctx, query, req.TimeRangeStart, req.TimeRangeEnd).Scan(&totalTime)
+	if err != nil {
+		l.Errorf("Failed to query total playtime: %v", err)
+		return nil, err
+	}
+
+	return &types.TotalPlayTimeResp{
+		TotalPlayTime: totalTime,
+	}, nil
+}