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/ai-assistant/page.tsx

@@ -343,7 +343,11 @@ export default function AIAssistantPage() {
                 <div className="text-center text-muted-foreground">
                   <Users className="h-16 w-16 mx-auto mb-4" />
                   <p className="text-lg">请完成所有分析步骤</p>
-                  <Button variant="outline" className="mt-4" onClick={() => setIsUserGroupDialogOpen(true)}>
+                  <Button
+                    variant="outline"
+                    className="mt-4 bg-transparent"
+                    onClick={() => setIsUserGroupDialogOpen(true)}
+                  >
                     <Users className="mr-2 h-4 w-4" />
                     开始设置
                   </Button>
@@ -612,7 +616,11 @@ export default function AIAssistantPage() {
                 <div className="text-center text-muted-foreground">
                   <Users className="h-16 w-16 mx-auto mb-4" />
                   <p className="text-lg">请完成所有策略步骤</p>
-                  <Button variant="outline" className="mt-4" onClick={() => setIsUserGroupDialogOpen(true)}>
+                  <Button
+                    variant="outline"
+                    className="mt-4 bg-transparent"
+                    onClick={() => setIsUserGroupDialogOpen(true)}
+                  >
                     <Users className="mr-2 h-4 w-4" />
                     开始设置
                   </Button>