feat: Add automated OpenAI account registration and Codex refresh token acquisition, and introduce a new S2A configuration page.

frontend/src/pages/S2AConfig.tsx

@@ -268,7 +268,8 @@ export default function S2AConfig() {
                                 <span className="text-sm text-slate-400">未设置分组</span>
                             )}
                         </div>
-                        <div className="flex gap-2 mt-2">
+                        <div className="flex gap-3 mt-2 items-stretch">
+                            <div className="flex-1 max-w-xs">
                                 <Input
                                     placeholder="输入分组 ID"
                                     type="number"
@@ -276,12 +277,15 @@ export default function S2AConfig() {
                                     value={newGroupId}
                                     onChange={(e) => setNewGroupId(e.target.value)}
                                     onKeyDown={(e) => e.key === 'Enter' && handleAddGroupId()}
+                                    className="h-10"
                                 />
+                            </div>
                             <Button
                                 variant="outline"
                                 onClick={handleAddGroupId}
                                 disabled={!newGroupId}
                                 icon={<Plus className="h-4 w-4" />}
+                                className="h-10 min-w-[100px] px-4"
                             >
                                 添加
                             </Button>