feat: 独立运维控制台 (sundynix-admin) — LLM 模型配置控制面前端

新增独立 Vite+React 控制台(:5174)，运维在此配置控制面，区别于桌面端构建者 UI。

- sundynix-admin: 模型页(列表[激活徽标/脱敏key] + 登记表单 + 测试连接 + 激活/删除)
  → 调 Gateway /api/v1/admin/models*；数据源/租户/护栏 占位(规划中)；Gateway 健康灯
- gateway CORS 补 DELETE（控制台删除模型用）
- Makefile admin 目标(Vite :5174); .claude/launch.json 加 admin-console

验证: npm build✓; 真实浏览器跑通——控制台拉到真实模型列表, 填表→测试连接
✓连接成功(HTTP 200,browser→GW→mock), 保存→表格新增行。激活会经 NATS 热更新
Dispatcher(上一提交已证)。控制台↔控制面↔Dispatcher 全链路打通。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-admin/src/api.ts

@@ -0,0 +1,66 @@
+// 运维控制台 → Gateway 控制面 API。
+export const GATEWAY: string =
+  (import.meta.env.VITE_GATEWAY as string | undefined) ?? "http://localhost:8080";
+const ADMIN = `${GATEWAY}/api/v1/admin`;
+
+export interface Model {
+  id: number;
+  provider: string;
+  base_url: string;
+  api_key: string; // 列表里是脱敏值
+  model: string;
+  active: boolean;
+}
+
+export interface ModelInput {
+  id?: number;
+  provider: string;
+  base_url: string;
+  api_key: string;
+  model: string;
+}
+
+export async function listModels(): Promise<Model[]> {
+  const res = await fetch(`${ADMIN}/models`);
+  if (!res.ok) throw new Error(`list failed: ${res.status}`);
+  return ((await res.json()) as { models: Model[] }).models;
+}
+
+export async function saveModel(m: ModelInput): Promise<number> {
+  const res = await fetch(`${ADMIN}/models`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(m),
+  });
+  const data = (await res.json()) as { id?: number; error?: string };
+  if (!res.ok) throw new Error(data.error ?? `save failed: ${res.status}`);
+  return data.id ?? 0;
+}
+
+export async function setActive(id: number): Promise<void> {
+  const res = await fetch(`${ADMIN}/models/${id}/active`, { method: "POST" });
+  if (!res.ok) throw new Error(`activate failed: ${res.status}`);
+}
+
+export async function deleteModel(id: number): Promise<void> {
+  const res = await fetch(`${ADMIN}/models/${id}`, { method: "DELETE" });
+  if (!res.ok) throw new Error(`delete failed: ${res.status}`);
+}
+
+export async function testModel(m: ModelInput): Promise<{ ok: boolean; message: string }> {
+  const res = await fetch(`${ADMIN}/models/test`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(m),
+  });
+  return (await res.json()) as { ok: boolean; message: string };
+}
+
+export async function gatewayOnline(): Promise<boolean> {
+  try {
+    const res = await fetch(`${GATEWAY}/api/v1/billing`);
+    return res.ok;
+  } catch {
+    return false;
+  }
+}