feat: embedding 配置搬上控制面 — 数据源页可视化配置 + 热更新

embedding 从 env 改为控制面驱动(持久化+可视化)，复用 chat 模型同套范式：
配置控制面泛化为按 kind(chat/embedding)，加 embedding kind。

- shared: 配置 subjects 泛化 sundynix.config.<kind>.get/.updated；bus 方法改 kind 参数
  (RequestConfig/ServeConfig/PublishConfigUpdated/SubscribeConfigUpdated)
- gateway: sundynix_model 加 kind 列(每 kind 唯一激活)+旧行回填 chat；admin 按 kind
  增删改/激活/列表，测试连接 embedding 走 POST /embeddings；main 按 kind ServeConfig；
  变更广播各 kind
- dispatcher: 取 chat 配置(kind 化)
- mcp-go: rag.Engine.SetEmbedding 热更新(RWMutex)；main 取/订阅 embedding 控制面配置
  (覆盖 env)
- admin 控制台: api 按 kind；抽出复用 ModelManager；ModelsPage(chat)+新 DatasourcesPage
  (embedding + 向量/图库占位)；routes 数据源页就绪
- 验证: 全模块 build✓ + e2e PASS + 控制台 npm build✓；live 全跑通——chat(DeepSeek 回填
  kind 仍工作)；mcp-go 不带 EMBED env 启动→控制台配 embedding(百炼)→测试连接✓→激活
  →NATS 热更新 mcp-go→入库+语义检索'存向量的数据库'→Milvus；浏览器数据源页拉到激活配置

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

sundynix-admin/src/components/ModelManager.tsx

@@ -0,0 +1,182 @@
+import { useEffect, useState } from "react";
+import {
+  listModels,
+  saveModel,
+  setActive,
+  deleteModel,
+  testModel,
+  type Kind,
+  type Model,
+  type ModelInput,
+} from "../api";
+
+// 复用的模型控制面：列表(激活/脱敏key) + 登记表单 + 测试连接 + 激活/删除。
+// 按 kind(chat/embedding) 区分，激活后经 NATS 热更新对应消费方。
+export function ModelManager({
+  kind,
+  title,
+  baseUrlHint,
+  modelHint,
+}: {
+  kind: Kind;
+  title: string;
+  baseUrlHint: string;
+  modelHint: string;
+}) {
+  const empty: ModelInput = { kind, provider: "openai-compatible", base_url: "", api_key: "", model: "" };
+  const [models, setModels] = useState<Model[]>([]);
+  const [form, setForm] = useState<ModelInput>(empty);
+  const [msg, setMsg] = useState("");
+  const [testing, setTesting] = useState(false);
+
+  const refresh = () => listModels(kind).then(setModels).catch((e) => setMsg(`✗ ${e.message}`));
+  useEffect(() => {
+    refresh();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [kind]);
+
+  const set = (k: keyof ModelInput, v: string) => setForm((f) => ({ ...f, [k]: v }));
+
+  const onSave = async () => {
+    try {
+      await saveModel({ ...form, kind });
+      setMsg("✓ 已保存");
+      setForm(empty);
+      refresh();
+    } catch (e) {
+      setMsg(`✗ ${(e as Error).message}`);
+    }
+  };
+
+  const onTest = async () => {
+    setTesting(true);
+    try {
+      const r = await testModel({ ...form, kind });
+      setMsg(r.ok ? `✓ 连接成功（${r.message}）` : `✗ 连接失败：${r.message}`);
+    } catch (e) {
+      setMsg(`✗ ${(e as Error).message}`);
+    } finally {
+      setTesting(false);
+    }
+  };
+
+  return (
+    <div className="flex flex-col gap-6">
+      <section>
+        <h2 className="mb-3 text-sm font-semibold text-gray-700">{title}</h2>
+        <div className="overflow-hidden rounded border">
+          <table className="w-full text-sm">
+            <thead className="bg-gray-50 text-left text-xs text-gray-500">
+              <tr>
+                <th className="px-3 py-2">状态</th>
+                <th className="px-3 py-2">Provider</th>
+                <th className="px-3 py-2">Base URL</th>
+                <th className="px-3 py-2">Model</th>
+                <th className="px-3 py-2">API Key</th>
+                <th className="px-3 py-2">操作</th>
+              </tr>
+            </thead>
+            <tbody>
+              {models.length === 0 && (
+                <tr>
+                  <td colSpan={6} className="px-3 py-4 text-center text-xs text-gray-400">
+                    暂无，使用下方表单登记。
+                  </td>
+                </tr>
+              )}
+              {models.map((m) => (
+                <tr key={m.id} className="border-t">
+                  <td className="px-3 py-2">
+                    {m.active ? (
+                      <span className="rounded bg-emerald-100 px-1.5 py-0.5 text-[10px] text-emerald-700">激活</span>
+                    ) : (
+                      <span className="text-[10px] text-gray-400">—</span>
+                    )}
+                  </td>
+                  <td className="px-3 py-2 text-gray-600">{m.provider}</td>
+                  <td className="px-3 py-2 font-mono text-xs text-gray-600">{m.base_url}</td>
+                  <td className="px-3 py-2 text-gray-800">{m.model}</td>
+                  <td className="px-3 py-2 font-mono text-xs text-gray-400">{m.api_key || "—"}</td>
+                  <td className="px-3 py-2">
+                    <div className="flex gap-2">
+                      {!m.active && (
+                        <button
+                          onClick={() => setActive(m.id).then(() => { setMsg("✓ 已激活并热更新"); refresh(); })}
+                          className="rounded border px-2 py-0.5 text-xs text-violet-600 hover:bg-violet-50"
+                        >
+                          激活
+                        </button>
+                      )}
+                      <button
+                        onClick={() => deleteModel(m.id).then(refresh)}
+                        className="rounded border px-2 py-0.5 text-xs text-rose-500 hover:bg-rose-50"
+                      >
+                        删除
+                      </button>
+                    </div>
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      </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>
+        <div className="grid grid-cols-2 gap-3">
+          <label className="text-xs text-gray-500">
+            Provider
+            <select
+              className="mt-1 w-full rounded border px-2 py-1 text-sm text-gray-900"
+              value={form.provider}
+              onChange={(e) => set("provider", e.target.value)}
+            >
+              <option value="openai-compatible">openai-compatible</option>
+              <option value="vllm">vllm（自部署）</option>
+            </select>
+          </label>
+          <label className="text-xs text-gray-500">
+            Model
+            <input
+              className="mt-1 w-full rounded border px-2 py-1 text-sm"
+              value={form.model}
+              onChange={(e) => set("model", e.target.value)}
+              placeholder={modelHint}
+            />
+          </label>
+          <label className="col-span-2 text-xs text-gray-500">
+            Base URL
+            <input
+              className="mt-1 w-full rounded border px-2 py-1 text-sm font-mono"
+              value={form.base_url}
+              onChange={(e) => set("base_url", e.target.value)}
+              placeholder={baseUrlHint}
+            />
+          </label>
+          <label className="col-span-2 text-xs text-gray-500">
+            API Key
+            <input
+              type="password"
+              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-…"
+            />
+          </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={onTest}
+            disabled={testing || !form.base_url}
+            className="rounded border px-3 py-1 text-sm disabled:opacity-40"
+          >
+            {testing ? "测试中…" : "测试连接"}
+          </button>
+          {msg && <span className="text-xs text-gray-600">{msg}</span>}
+        </div>
+      </section>
+    </div>
+  );
+}