refactor: 全面代码重构与项目结构整理

安全性:
- 所有SQL查询改用参数化查询(db_query)，防止SQL注入
- TUSHARE_API_TOKEN集中到config.php常量，移除硬编码和多份拷贝
- getBasic.inc.php中$_REQUEST输出到JS时添加htmlspecialchars转义

代码组织:
- 21个页面文件移至charts/子目录，根目录仅保留入口文件
- ajax.inc.php拆分：esfTradeDaily/esfListDaily迁至getEstate.inc.php
- getBasic.inc.php拆分：HTML组件函数迁至新建的widgets.inc.php
- 前端依赖去重：移除lib/echarts.min.js、libai/3.4.16.js、research/js/3.4.16.js

规范化:
- AJAX响应格式统一为jsonResponse()标准封装
- 前端全局变量统一为window.chartConfig对象模式
- 修复PHP 8.4 Deprecated警告(getEstateData、getStockHistoryDataByTS参数顺序)
- html/head.php中jQuery/CSS路径改为绝对路径，修复charts/子目录加载问题

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

charts/realestate.php

@@ -0,0 +1,39 @@
+<?php
+include_once "../inc/getBasic.inc.php";
+include_once "../inc/getData.inc.php";
+include_once "../inc/postJson.inc.php";
+include_once "../inc/getEstate.inc.php";
+$_REQUEST['t_start']=$_REQUEST['t_start']?$_REQUEST['t_start']:'2023-06-20';
+$_REQUEST['t_end']=$_REQUEST['t_end']?$_REQUEST['t_end']:date('Y-m-d');
+
+$title="房地产挂牌数量趋势(宁波)";
+
+$data=getEstateData('宁波',$_REQUEST['t_start'],$_REQUEST['t_end']);
+$legend=array('挂牌数(套)');
+include_once "../html/head.php";
+?>
+
+<form name="main" id="main" method="get"> <div style="width:100%;text-align:center">
+开始时间: <input type='date' name='t_start' id='t_start' width='30px' value='<?=$_REQUEST['t_start']?>' >
+结束时间: <input type='date' name='t_end' id='t_end' width='30px' value='<?=$_REQUEST['t_end']?>' >
+<input type='submit' value="给我查!">
+<div >&nbsp;</div>
+
+</div> </form>
+<div >&nbsp;</div>
+<div id="container" style="margin:0 auto;height: 400px;width: 1000px"></div>
+<div >&nbsp;</div>
+<div style="margin:0 auto;width: 1000px ">
+<span style="color:grey">
+* 数据来源：<a href='https://www.cnnbfdc.com/' target='_blank'>宁波市房产交易服务信息网</a><br />
+* 更新时间：每天上午9:00</span></div>
+    <script type="text/javascript">
+        window.chartConfig = {
+            data: <?php echo json_encode($data); ?>,
+            legend: <?php echo json_encode($legend); ?>,
+            title: '<?php echo $title; ?>'
+        };
+    </script>
+<script type="text/javascript" src="../js/estate.js?version=3.24"></script>
+<?php include_once "../html/footer.php"; ?>
+