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/totalkillcountlogic.go

@@ -0,0 +1,73 @@
+package logic
+
+import (
+	"context"
+	"fmt"
+
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/svc"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/types"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type TotalKillCountLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+// Get total kill count within a specified time range
+func NewTotalKillCountLogic(ctx context.Context, svcCtx *svc.ServiceContext) *TotalKillCountLogic {
+	return &TotalKillCountLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *TotalKillCountLogic) TotalKillCount(req *types.TotalKillCountReq) (resp *types.TotalKillCountResp, err error) {
+	query := `
+		SELECT COUNT(*)
+		FROM steam_union.event_player_death_log
+		WHERE event_player_death_time >= TO_TIMESTAMP($1 / 1000.0)
+			AND event_player_death_time <= TO_TIMESTAMP($2 / 1000.0)
+			AND attacker_steamid64 > 1
+	`
+
+	args := []interface{}{req.TimeRangeStart, req.TimeRangeEnd}
+	argIndex := 3
+
+	// Add headshot filter if requested
+	if req.HeadshotOnly {
+		query += ` AND headshot = true`
+	}
+
+	// Add weapon filter if provided
+	if len(req.WeaponFilter) > 0 {
+		query += fmt.Sprintf(` AND weapon = ANY($%d)`, argIndex)
+		args = append(args, req.WeaponFilter)
+		argIndex++
+	}
+
+	// Add player filter if provided
+	if len(req.PlayerFilter) > 0 {
+		// Convert []string to []int64 for steamid64
+		steamIDs := make([]int64, len(req.PlayerFilter))
+		for i, id := range req.PlayerFilter {
+			fmt.Sscanf(id, "%d", &steamIDs[i])
+		}
+		query += fmt.Sprintf(` AND attacker_steamid64 = ANY($%d)`, argIndex)
+		args = append(args, steamIDs)
+	}
+
+	var count int64
+	err = l.svcCtx.DB.QueryRowContext(l.ctx, query, args...).Scan(&count)
+	if err != nil {
+		l.Errorf("Failed to query total kill count: %v", err)
+		return nil, err
+	}
+
+	return &types.TotalKillCountResp{
+		TotalKillCount: count,
+	}, nil
+}