chore: 清理 3 处 unused-vars 回归 (BuildNodesManager/DeployRBAC/ToolConfigTab)

- BuildNodesManager.tsx: 移除未使用 Server import
- DeployRBAC.tsx: 移除未使用 Save import
- ToolConfigTab.tsx: 移除未使用 useTranslation + t 变量
- ESLint unused: 3 → 0, any: 37 (稳定), tsc -b=0, npm build ✓

frontend/src/components/deploy/BuildNodesManager.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useCallback } from 'react';
-import { Plus, Pencil, Trash2, RefreshCw, Server, Cpu } from 'lucide-react';
+import { Plus, Pencil, Trash2, RefreshCw, Cpu } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Badge } from '@/components/ui/badge';