feat: 新增日程面板、复盘页面与 Agent 读写接口

- 日程：单次/每日/每周/每月重复，JSON 存储，月历按优先级着色圆点 + 悬停提示
- 复盘页：可自定义折线图卡片(SVG) + 每日心得总览(按日期/任务展开)
- Agent 接口：GET /api/agent/overview 读日程+进度，POST /api/agent/schedules 建日程(PPM_API_TOKEN Bearer 鉴权)
- 导出/导入/统计纳入日程与图表；47 项测试全绿

app/static/index.html

@@ -15,6 +15,7 @@
         <span><strong>进度台</strong><small id="logicalDate"></small></span>
       </button>
       <div class="top-actions">
+        <button class="button" id="reviewButton" type="button">复盘</button>
         <button class="button primary" id="addTaskButton" type="button">＋ 新建任务</button>
         <button class="icon-button" id="adminButton" type="button" title="数据管理" aria-label="数据管理">⚙</button>
       </div>
@@ -45,6 +46,35 @@
     </form>
   </dialog>
 
+  <dialog id="scheduleDialog" class="dialog schedule-dialog">
+    <form id="scheduleForm">
+      <div class="dialog-heading"><div><p class="eyebrow">日程定义</p><h2 id="scheduleDialogTitle">新建日程</h2></div><button class="icon-button" id="closeScheduleButton" type="button" title="关闭" aria-label="关闭">×</button></div>
+      <div class="form-grid">
+        <label class="wide">标题<input name="title" required maxlength="120"></label>
+        <label>日期<input name="date" type="date"></label>
+        <label>时间<input name="time" type="time" maxlength="5"></label>
+        <label>重复<select name="recurrence"><option value="none">不重复</option><option value="daily">每天</option><option value="weekly">每周</option><option value="monthly">每月</option></select></label>
+        <label>优先级<select name="priority"><option value="1">1 · 紧急</option><option value="2">2 · 高</option><option value="3" selected>3 · 正常</option><option value="4">4 · 低</option><option value="5">5 · 低优先</option></select></label>
+        <label>状态<select name="state"><option value="active">进行中</option><option value="archived">已归档</option></select></label>
+        <label class="wide">说明<textarea name="description" maxlength="2000" rows="3"></textarea></label>
+      </div>
+      <div class="dialog-actions"><button class="button" id="cancelScheduleButton" type="button">取消</button><button class="button primary" type="submit">保存日程</button></div>
+    </form>
+  </dialog>
+
+  <dialog id="chartDialog" class="dialog chart-dialog">
+    <form id="chartForm">
+      <div class="dialog-heading"><div><p class="eyebrow">REVIEW</p><h2 id="chartDialogTitle">添加图表</h2></div><button class="icon-button" id="closeChartButton" type="button" title="关闭" aria-label="关闭">×</button></div>
+      <div class="form-grid">
+        <label class="wide">标题<input name="title" required maxlength="80"></label>
+        <label>任务<select name="taskId" id="chartTaskSelect"><option value="">全部任务</option></select></label>
+        <label>指标<select name="metricId" id="chartMetricSelect"><option value="">完成数</option></select></label>
+        <label>天数<input name="days" type="number" min="7" max="365" value="30" required></label>
+      </div>
+      <div class="dialog-actions"><button class="button" id="cancelChartButton" type="button">取消</button><button class="button primary" type="submit">保存图表</button></div>
+    </form>
+  </dialog>
+
   <dialog id="adminDialog" class="dialog admin-dialog">
     <div class="dialog-heading"><div><p class="eyebrow">后台</p><h2>数据管理</h2></div><button class="icon-button" id="closeAdminButton" title="关闭" aria-label="关闭">×</button></div>
     <div class="admin-actions"><button class="button" id="exportButton">导出 JSON</button><button class="button" id="importButton">导入还原</button><input type="file" id="importFile" accept="application/json,.json" hidden><button class="button" id="archiveButton">执行补归档</button><button class="button" id="logoutButton">退出登录</button></div>