style:更新所有Modal弹窗样式使用自定义风格

frontend/src/pages/Careers.tsx

@@ -39,6 +39,7 @@ export default function Careers() {
     const [editingCareer, setEditingCareer] = useState<Career | null>(null);
     const [form] = Form.useForm();
     const [aiForm] = Form.useForm();
+    const [modal, contextHolder] = Modal.useModal();
 
     // AI生成状态
     const [aiGenerating, setAiGenerating] = useState(false);
@@ -129,9 +130,10 @@ export default function Careers() {
     };
 
     const handleDelete = async (id: string) => {
-        Modal.confirm({
+        modal.confirm({
             title: '确认删除',
             content: '确定要删除这个职业吗？如果有角色使用了该职业，将无法删除。',
+            centered: true,
             onOk: async () => {
                 try {
                     await api.delete(`/careers/${id}`);
@@ -264,7 +266,9 @@ export default function Careers() {
     ];
 
     return (
-        <div style={{
+        <>
+            {contextHolder}
+            <div style={{
             height: '100%',
             display: 'flex',
             flexDirection: 'column',
@@ -423,6 +427,7 @@ export default function Careers() {
                 title="AI生成新职业中..."
                 onCancel={() => setAiGenerating(false)}
             />
-        </div>
+            </div>
+        </>
     );
 }

frontend/src/pages/MCPPlugins.tsx

@@ -113,9 +113,10 @@ export default function MCPPluginsPage() {
   };
 
   const handleDelete = (plugin: MCPPlugin) => {
-    Modal.confirm({
+    modal.confirm({
       title: '删除插件',
       content: `确定要删除插件 "${plugin.display_name || plugin.plugin_name}" 吗？`,
+      centered: true,
       okText: '确定',
       cancelText: '取消',
       okType: 'danger',

frontend/src/pages/Relationships.tsx

@@ -43,6 +43,7 @@ export default function Relationships() {
   const [isEditMode, setIsEditMode] = useState(false);
   const [editingRelationship, setEditingRelationship] = useState<Relationship | null>(null);
   const [form] = Form.useForm();
+  const [modal, contextHolder] = Modal.useModal();
   const [isMobile, setIsMobile] = useState(window.innerWidth <= 768);
   const [pageSize, setPageSize] = useState(10);
   const [currentPage, setCurrentPage] = useState(1);
@@ -149,7 +150,7 @@ export default function Relationships() {
   };
 
   const handleDeleteRelationship = async (id: string) => {
-    Modal.confirm({
+    modal.confirm({
       title: '确认删除',
       content: '确定要删除这条关系吗？',
       centered: true,
@@ -304,8 +305,10 @@ export default function Relationships() {
   };
 
   return (
-    <div>
-      <Card
+    <>
+      {contextHolder}
+      <div>
+        <Card
         title={
           <Space wrap>
             <ApartmentOutlined />
@@ -522,6 +525,7 @@ export default function Relationships() {
           </Form.Item>
         </Form>
       </Modal>
-    </div>
+      </div>
+    </>
   );
 }

frontend/src/pages/Settings.tsx

@@ -107,9 +107,10 @@ export default function SettingsPage() {
   };
 
   const handleReset = () => {
-    Modal.confirm({
+    modal.confirm({
       title: '重置设置',
       content: '确定要重置为默认值吗？',
+      centered: true,
       okText: '确定',
       cancelText: '取消',
       onOk: () => {
@@ -127,9 +128,10 @@ export default function SettingsPage() {
   };
 
   const handleDelete = () => {
-    Modal.confirm({
+    modal.confirm({
       title: '删除设置',
       content: '确定要删除所有设置吗？此操作不可恢复。',
+      centered: true,
       okText: '确定',
       cancelText: '取消',
       okType: 'danger',