feat(admin): 模型配置加「编辑」按钮 + 语音默认提示改 deepseek-v4-flash

- ModelManager: 每行加「编辑」→ 载入表单就地改(api_key 留空=沿用现有密钥),
  后端按 id 走更新而非新增;表单头/按钮随编辑态切换,带「取消」;省去删了重登记
- ModelsPage: 语音默认模型提示 deepseek-chat→deepseek-v4-flash(chat 2026/07/24 弃用)

注:语音模型实例已通过 admin API 从 deepseek-chat 热切到 deepseek-v4-flash(dispatcher
现读 v4-flash,无需重启)——验证了编辑/激活的 NATS 热更新链路。

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

sundynix-admin/src/components/ModelManager.tsx

@@ -37,10 +37,18 @@ export function ModelManager({
 
   const set = (k: keyof ModelInput, v: string) => setForm((f) => ({ ...f, [k]: v }));
 
+  const editing = !!form.id;
+
+  // onEdit 把某行载入表单就地编辑（api_key 留空＝沿用现有密钥，后端按 id 更新而非新增）。
+  const onEdit = (m: Model) => {
+    setForm({ id: m.id, kind, provider: m.provider, base_url: m.base_url, api_key: "", model: m.model });
+    setMsg("");
+  };
+
   const onSave = async () => {
     try {
       await saveModel({ ...form, kind });
-      setMsg("✓ 已保存");
+      setMsg(editing ? "✓ 已更新并热更新" : "✓ 已保存");
       setForm(empty);
       refresh();
     } catch (e) {
@@ -107,6 +115,12 @@ export function ModelManager({
                           激活
                         </button>
                       )}
+                      <button
+                        onClick={() => onEdit(m)}
+                        className="rounded border px-2 py-0.5 text-xs text-gray-600 hover:bg-gray-50"
+                      >
+                        编辑
+                      </button>
                       <button
                         onClick={() => {
                           // 删除不可撤销，且删掉在用模型会直接打断线上推理——所以要二次确认，
@@ -131,7 +145,9 @@ export function ModelManager({
       </section>
 
       <section className="max-w-xl">
-        <h2 className="mb-3 text-sm font-semibold text-gray-700">登记（开发期：第三方在线 API，OpenAI 兼容）</h2>
+        <h2 className="mb-3 text-sm font-semibold text-gray-700">
+          {editing ? `编辑「${form.model}」（改完保存即热更新）` : "登记（开发期：第三方在线 API，OpenAI 兼容）"}
+        </h2>
         <div className="grid grid-cols-2 gap-3">
           <label className="text-xs text-gray-500">
             Provider
@@ -170,12 +186,14 @@ export function ModelManager({
               className="mt-1 w-full rounded border px-2 py-1 text-sm font-mono"
               value={form.api_key}
               onChange={(e) => set("api_key", e.target.value)}
-              placeholder="sk-…"
+              placeholder={editing ? "留空＝沿用现有密钥" : "sk-…"}
             />
           </label>
         </div>
         <div className="mt-3 flex items-center gap-2">
-          <button onClick={onSave} className="rounded bg-violet-600 px-3 py-1 text-sm text-white">保存</button>
+          <button onClick={onSave} className="rounded bg-violet-600 px-3 py-1 text-sm text-white">
+            {editing ? "更新" : "保存"}
+          </button>
           <button
             onClick={onTest}
             disabled={testing || !form.base_url}
@@ -183,6 +201,14 @@ export function ModelManager({
           >
             {testing ? "测试中…" : "测试连接"}
           </button>
+          {editing && (
+            <button
+              onClick={() => { setForm(empty); setMsg(""); }}
+              className="rounded border px-3 py-1 text-sm text-gray-500 hover:bg-gray-50"
+            >
+              取消
+            </button>
+          )}
           {msg && <span className="text-xs text-gray-600">{msg}</span>}
         </div>
       </section>

sundynix-admin/src/pages/ModelsPage.tsx

@@ -52,7 +52,7 @@ export function ModelsPage() {
             kind="voice"
             title="JARVIS 语音模型 (voice → 语音对话，选快模型抢首字时延)"
             baseUrlHint="https://api.deepseek.com"
-            modelHint="deepseek-chat"
+            modelHint="deepseek-v4-flash"
           />
         )}
         {tab === "embedding" && (