refactor: 前端库整理与图表标准化

库文件整理:
- 所有JS/CSS/字体库统一到lib/js/、lib/css/、lib/webfonts/
- 按名称-版本格式重命名(jquery-3.6.0.min.js等)
- 删除约80个重复/废弃的库文件副本
- 更新17个文件中的引用路径

图表模式标准化:
- moneyflow/realestate/estate3个页面从$.ajax/PHP注入转为fetch+loading overlay模式
- 新增moneyflowData/estateData两个AJAX端点
- chartmoneyflow.js、estate.js移至deprecated

README.md更新为完整功能介绍

Co-Authored-By: Claude Code <noreply@anthropic.com>

lib/DataTables-2/FixedColumns-4.2.2/css/fixedColumns.jqueryui.min.css

@@ -1 +0,0 @@
-table.dataTable thead tr>.dtfc-fixed-left,table.dataTable thead tr>.dtfc-fixed-right,table.dataTable tfoot tr>.dtfc-fixed-left,table.dataTable tfoot tr>.dtfc-fixed-right{top:0;bottom:0;z-index:3;background-color:white}table.dataTable tbody tr>.dtfc-fixed-left,table.dataTable tbody tr>.dtfc-fixed-right{z-index:1;background-color:white}div.dtfc-left-top-blocker,div.dtfc-right-top-blocker{background-color:white}div.dtfc-right-top-blocker{border-bottom:none !important;background-color:rgb(246, 246, 246) !important;border-top:1px solid #c5c5c5 !important}tr.dt-rowReorder-moving td.dtfc-fixed-left,tr.dt-rowReorder-moving td.dtfc-fixed-right{border-top:2px solid #555 !important;border-bottom:2px solid #555 !important}tr.dt-rowReorder-moving td.dtfc-fixed-left:first-child{border-left:2px solid #555 !important}tr.dt-rowReorder-moving td.dtfc-fixed-right:last-child{border-right:2px solid #555 !important}