【性能调优】出生点分流：新手村出生位置的负载分散

-- 出生分流：尾号映射
local player = class(actor)
local GATES = 16
local function birthPos(player, accountId)
    local gate = accountId % GATES
    local jitterX = math.random(-2, 2)
    local jitterY = math.random(-2, 2)
    local baseX = 100 + (gate % 4) * 20
    local baseY = 100 + math.floor(gate / 4) * 20
    return baseX + jitterX, baseY + jitterY
end

-- 密度兜底：超员迁移
local player = class(actor)
local cellCount = {}
local function migrateIfCrowded(player, x, y, accountId)
    local key = x .. "_" .. y
    cellCount[key] = (cellCount[key] or 0) + 1
    if cellCount[key] > 15 then
        local gate = (accountId + 7) % GATES
        x = 100 + (gate % 4) * 20
        y = 100 + math.floor(gate / 4) * 20
        beginteleport(player, x, y)
        sendmsg(player, 1, 0, "出生地人多，已为其安排到安静的村口。")
    end
end