【数据存储】配置中心：全服配置的统一读取与热更新

local Config = { data = {}, version = 0 }

function Config.reload()
    local text = readFile("cfg/center.json")        -- 或从 Redis/接口拉取
    if not text then return false, "配置文件缺失" end
    local ok, parsed = pcall(jsonDecode, text)
    if not ok then return false, "配置格式错误" end
    if parsed.version <= Config.version then return true end   -- 版本未变，跳过
    Config.data = parsed
    Config.version = parsed.version
    EventBus.emit("CONFIG_RELOADED", parsed)
    return true
end

function Config.get(path, default)
    local node = Config.data
    for seg in (path .. "."):gmatch("([^%.]*)%.") do
        node = node and node[seg]
        if not node then break end
    end
    return node ~= nil and node or default
end

-- 业务读取示例
local rate = Config.get("game.exp_rate", 1)