feat: 经营月报卡片改名+样式优化+切换工作台默认经营月报

- 业务线经营情况→部门损益情况,副标题改为部门利润公式
- 业务线现金流→部门现金流,副标题改为部门现金流公式
- 财务月度/季度概览→项目经营详情
- 3个卡片主副标题加大+间距对齐+颜色加深
- 签约月份/添加月份/平台费用月份默认当前月份
- 切换工作台默认显示经营月报
- 版本号 v1.2.0.21

templates/index.html

@@ -76,7 +76,7 @@
     <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">v1.2.0.20</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">v1.2.0.21</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">