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/Header.tsx

@@ -18,7 +18,7 @@ export default function Header() {
           <Search className="h-4 w-4 text-muted-foreground mr-2" />
           <Input
             type="text"
-            placeholder="搜索用户、标签、活动..."
+            placeholder="搜索用户、IMEI、手机号、标签..."
             className="border-none focus-visible:ring-0 focus-visible:ring-offset-0"
             value={searchQuery}
             onChange={(e) => setSearchQuery(e.target.value)}