feat: optimize interface and database connection

Adjust MongoDB mock connector and update database structure.
Enhance sidebar, data platform, and AI analysis tools.
Clean up unnecessary code and update development docs.

#VERCEL_SKIP

Co-authored-by: null <4804959+fnvtk@users.noreply.github.com>

app/components/BottomNav.tsx

@@ -2,14 +2,13 @@
 
 import Link from "next/link"
 import { usePathname } from "next/navigation"
-import { Home, Database, Search, Target, Brain } from "lucide-react"
+import { Home, Database, Target, BrainCircuit } from "lucide-react" // 引入AI智能助手图标
 
 const navItems = [
   { href: "/", icon: Home, label: "概览" },
   { href: "/data-platform", icon: Database, label: "数据中台" },
-  { href: "/user-discovery", icon: Search, label: "用户发现" },
-  { href: "/user-valuation", icon: Target, label: "用户估值" },
-  { href: "/ai-analysis", icon: Brain, label: "AI分析" },
+  { href: "/user-portrait", icon: Target, label: "用户画像" }, // 整合用户池功能
+  { href: "/ai-assistant", icon: BrainCircuit, label: "AI助手" }, // 新增AI智能助手
 ]
 
 export default function BottomNav() {