feat(frontend): add memory components, temple/war-room pages, and composables

- Add DailyDigestCard and ReminderToast memory components
- Add temple and war-room page routes
- Add memory API module with TypeScript definitions
- Add chat composables: useClientTime, useDailyDigest, useSidebarPlan
- Simplify chat/logs/settings pages (remove unused code)
- Add settingsPage.css

frontend/src/pages/war-room/index.vue

@@ -0,0 +1,56 @@
+<script setup lang="ts">
+// 战情室 - War Room
+</script>
+
+<template>
+  <div class="war-room-page">
+    <div class="page-header">
+      <h1>🗺️ 战情室</h1>
+      <p class="subtitle">运筹帷幄，决胜千里</p>
+    </div>
+    <div class="page-content">
+      <div class="placeholder-content">
+        <div class="war-icon">⚔️</div>
+        <p>战情室 - 敬请期待</p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.war-room-page {
+  padding: 24px;
+  min-height: 100vh;
+  background: var(--bg-primary);
+}
+
+.page-header {
+  text-align: center;
+  margin-bottom: 32px;
+}
+
+.page-header h1 {
+  font-size: 28px;
+  color: var(--text-primary);
+  margin-bottom: 8px;
+}
+
+.subtitle {
+  color: var(--text-secondary);
+  font-size: 14px;
+}
+
+.placeholder-content {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  min-height: 400px;
+  color: var(--text-secondary);
+}
+
+.war-icon {
+  font-size: 64px;
+  margin-bottom: 16px;
+}
+</style>