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/MobileHeader.tsx

@@ -10,7 +10,7 @@ interface MobileHeaderProps {
   title?: string
 }
 
-export default function MobileHeader({ onMenuToggle, title = "数据资产中台" }: MobileHeaderProps) {
+export default function MobileHeader({ onMenuToggle, title = "卡若数据资产中台" }: MobileHeaderProps) {
   const [showSearch, setShowSearch] = useState(false)
   const [searchQuery, setSearchQuery] = useState("")
 
@@ -46,7 +46,7 @@ export default function MobileHeader({ onMenuToggle, title = "数据资产中台
             <div className="flex-1">
               <Input
                 type="text"
-                placeholder="搜索用户、标签、活动..."
+                placeholder="搜索用户、IMEI、手机号..."
                 className="glass-input border-none focus-visible:ring-0 focus-visible:ring-offset-0"
                 value={searchQuery}
                 onChange={(e) => setSearchQuery(e.target.value)}