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/recentchatmessagelogic.go

@@ -0,0 +1,60 @@
+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 RecentChatMessageLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+// Get recent chat messages within a specified time range
+func NewRecentChatMessageLogic(ctx context.Context, svcCtx *svc.ServiceContext) *RecentChatMessageLogic {
+	return &RecentChatMessageLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *RecentChatMessageLogic) RecentChatMessage(req *types.RecentChatMessageReq) (resp *types.RecentChatMessageResp, err error) {
+	query := `
+		SELECT steamid64, player_name, message, 
+			EXTRACT(EPOCH FROM message_time)::BIGINT * 1000 as timestamp,
+			server_name, mapname, server_ip, server_port
+		FROM steam_union.chat_log
+		WHERE message_time >= TO_TIMESTAMP($1 / 1000.0) 
+			AND message_time <= TO_TIMESTAMP($2 / 1000.0)
+		ORDER BY message_time DESC
+		LIMIT $3
+	`
+
+	rows, err := l.svcCtx.DB.QueryContext(l.ctx, query, req.TimeRangeStart, req.TimeRangeEnd, req.Limit)
+	if err != nil {
+		l.Errorf("Failed to query recent chat messages: %v", err)
+		return nil, err
+	}
+	defer rows.Close()
+
+	var messages []types.RecentChatMessageRespMessage
+	for rows.Next() {
+		var msg types.RecentChatMessageRespMessage
+		if err := rows.Scan(&msg.SteamID64, &msg.UserName, &msg.Message, &msg.TimeStamp,
+			&msg.ServerName, &msg.MapName, &msg.ServerIP, &msg.ServerPort); err != nil {
+			l.Errorf("Failed to scan chat message: %v", err)
+			continue
+		}
+		messages = append(messages, msg)
+	}
+
+	return &types.RecentChatMessageResp{
+		Messages: messages,
+	}, nil
+}