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/DeployRBAC.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useMemo } from 'react';
-import { Shield, Plus, Trash2, Save, Loader2, Users, GitBranch, UserPlus, Check, X } from 'lucide-react';
+import { Shield, Plus, Trash2, Loader2, Users, GitBranch, UserPlus, Check, X } from 'lucide-react';
 import { Card, CardContent } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';