feat: add AI descriptions and platform submission checks

frontend/src/ai/ModelSettingsPanel.tsx

@@ -16,6 +16,7 @@ export function ModelSettingsPanel() {
   const [draft, setDraft] = useState({
     base_url: "",
     model: "",
+    description_model: "",
     protocol: "chat_completions",
     enabled: false,
   });
@@ -27,6 +28,7 @@ export function ModelSettingsPanel() {
     setDraft({
       base_url: value.base_url,
       model: value.model,
+      description_model: value.description_model ?? "",
       protocol: value.protocol,
       enabled: value.enabled,
     });
@@ -117,6 +119,17 @@ export function ModelSettingsPanel() {
               placeholder="供应商提供的模型名称"
             />
           </label>
+          <label>
+            Description 模型标识
+            <Input
+              aria-label="Description 模型标识"
+              value={draft.description_model}
+              onChange={(description_model) =>
+                setDraft({ ...draft, description_model })
+              }
+              placeholder="用于 Alpha 三段式描述的模型名称"
+            />
+          </label>
           <label>
             API Key
             <Input
@@ -149,7 +162,9 @@ export function ModelSettingsPanel() {
         </div>
         <p className="muted">
           填写服务端可访问的 API 根地址，按供应商要求包含 /v1；无需填写
-          /chat/completions 或 /responses。密钥加密保存在后端。
+          /chat/completions 或 /responses。密钥加密保存在后端。 Description
+          模型与研究助手共享 Base URL、API Key
+          和接口协议；留空时不启用描述生成。
         </p>
         <Checkbox
           checked={draft.enabled}

frontend/src/ai/types.ts

@@ -4,6 +4,7 @@ import type { Job, Research } from "../types";
 export type ModelSettings = {
   base_url: string;
   model: string;
+  description_model: string;
   protocol: "chat_completions" | "responses";
   configured: boolean;
   enabled: boolean;