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';

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';

frontend/src/components/deploy/ToolConfigTab.tsx

@@ -1,5 +1,4 @@
 import { useState, useEffect } from 'react';
-import { useTranslation } from 'react-i18next';
 import { RefreshCw, Loader2, Download, CheckCircle, XCircle, Clock, Settings2, ChevronDown, Trash2 } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
@@ -35,7 +34,6 @@ const categoryColor: Record<string, string> = {
 const VERSIONED_TOOLS = ['jdk', 'golang', 'nodejs', 'maven', 'nvm'];
 
 export default function ToolConfigTab() {
-  const { t } = useTranslation();
   const confirm = useConfirm();
   const [tools, setTools] = useState<ToolConfig[]>([]);
   const [loading, setLoading] = useState(false);