fix: 计划模块弹窗完整修复

- 弹窗HTML从finance.js干净复制, 结构完全对齐
- 25个modal ID加plan_前缀, 与实际模块零冲突
- 16个window函数+4个全局函数加plan前缀, 避免覆盖
- closePlanModal关闭后调用render()清理DOM
- CSS 5条规则加上#planModal选择器
- isUnsigned=false, 表格14列+卡片14个
- 版本号 v1.0.0.20

templates/index.html

@@ -80,7 +80,7 @@
     <header class="topbar border-b border-slate-200 bg-white px-8 py-5">
       <div class="flex items-center gap-3 w-full">
         <div class="flex-1">
-          <p class="eyebrow text-xs font-semibold uppercase tracking-[0.18em] text-blue-700">OPC Manager <span class="ml-2 text-xs font-normal text-slate-400 tracking-normal">v1.0.0.19</span></p>
+          <p class="eyebrow text-xs font-semibold uppercase tracking-[0.18em] text-blue-700">OPC Manager <span class="ml-2 text-xs font-normal text-slate-400 tracking-normal">v1.0.0.20</span></p>
           <div class="flex items-center gap-4 mt-1">
             <h1 class="text-2xl font-semibold" id="workspaceTitle">科普 OPC 工作台</h1>
             <div class="hidden sm:flex items-center gap-1.5 bg-gradient-to-r from-blue-50 to-indigo-50 border border-blue-100 rounded-full px-4 py-1.5">