M2b：删除旧 chat 体系——线性会话/叩心/情绪/纪念日模型与页面退役（迁移 003 双向验证），runs 去会话外键，测试全量修剪

frontend/src/components/layout/Sidebar.tsx

@@ -7,7 +7,6 @@ import { LogoButton } from "@/components/easter-egg/LogoButton";
 import {
   AdminIcon,
   ArchiveIcon,
-  ChatIcon,
   CharacterIcon,
   CosmosIcon,
   DriveIcon,
@@ -17,7 +16,6 @@ import {
   PersonalityIcon,
   RunIcon,
   SettingsIcon,
-  TimeIcon,
   ToolsIcon,
   WorldIcon,
   WuxingIcon,
@@ -53,10 +51,7 @@ interface NavGroup {
 const NAV_GROUPS: NavGroup[] = [
   {
     title: "灵台",
-    items: [
-      { href: "/chat", label: "对话", icon: <ChatIcon /> },
-      { href: "/runs", label: "轨迹", icon: <RunIcon /> },
-    ],
+    items: [{ href: "/runs", label: "轨迹", icon: <RunIcon /> }],
   },
   {
     title: "法身",
@@ -83,12 +78,6 @@ const NAV_GROUPS: NavGroup[] = [
         icon: <WorldIcon />,
         enabled: FEATURE_FLAGS.worldPanel,
       },
-      {
-        href: "/time",
-        label: "时态",
-        icon: <TimeIcon />,
-        enabled: FEATURE_FLAGS.timePanel,
-      },
     ],
   },
   {