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/totalplayercountlogic.go

@@ -0,0 +1,46 @@
+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 TotalPlayerCountLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+// Get total player count within a specified time range
+func NewTotalPlayerCountLogic(ctx context.Context, svcCtx *svc.ServiceContext) *TotalPlayerCountLogic {
+	return &TotalPlayerCountLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *TotalPlayerCountLogic) TotalPlayerCount(req *types.TotalPlayerCountReq) (resp *types.TotalPlayerCountResp, err error) {
+	query := `
+		SELECT COUNT(DISTINCT steamid64)
+		FROM steam_user
+		WHERE jointime >= TO_TIMESTAMP($1 / 1000.0) 
+			AND jointime <= TO_TIMESTAMP($2 / 1000.0)
+			AND steamid64 > 1
+	`
+
+	var count int64
+	err = l.svcCtx.DB.QueryRowContext(l.ctx, query, req.TimeRangeStart, req.TimeRangeEnd).Scan(&count)
+	if err != nil {
+		l.Errorf("Failed to query total player count: %v", err)
+		return nil, err
+	}
+
+	return &types.TotalPlayerCountResp{
+		Count: count,
+	}, nil
+}