feat(ai-writing): 检索类型加回「知识库检索」(直连内网 ES 接口)

弱模型常识别不了配置技能(deepseek-chat 等),恢复旧的"不用技能"检索路径
作为独立检索类型 knowledge_base:绕过技能编排,直接调
ai_writing.intranet_search_url 内网知识库 ES 接口(IntranetSearchProvider)
对检索词并发检索;未配地址 → 无素材 + skill_error 告警。

- researcher.py: material_source 归一保留 knowledge_base + 新增直连内网分支
- state.py: material_source 三值注释
- 前端 AIWritingForm/WritingFormContext/types: 下拉新增「知识库检索」
- tests/test_ai_writing_knowledge_base.py: 直连/未配/不编排技能 3 用例
- backend CLAUDE.md: 检索类型段更新为三值

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/open-canvas/components/ai-writing/AIWritingForm.tsx

@@ -40,11 +40,12 @@ const INPUT_CLASS =
 
 const DEFAULT_KEYWORD_COUNT = 1;
 const DEFAULT_AUDIENCE = '普通读者';
-type MaterialSource = 'general' | 'notebook';
+type MaterialSource = 'general' | 'knowledge_base' | 'notebook';
 const MAX_INTENT_LENGTH = 500;
 
 const MATERIAL_SOURCE_OPTIONS: Array<{ value: MaterialSource; label: string; desc: string }> = [
   { value: 'general', label: '通用检索', desc: '用素材收集专家配置的技能检索（默认：知识库检索）' },
+  { value: 'knowledge_base', label: '知识库检索', desc: '直连内网知识库检索接口，不走技能编排' },
   { value: 'notebook', label: '我的空间', desc: '从空间中检索素材' },
 ];
 

frontend-web/src/open-canvas/contexts/WritingFormContext.tsx

@@ -37,8 +37,8 @@ export interface WritingFormValue {
   /** 是否在成稿里加参考文献（正文 [n] 角标 + 文末「参考文献」列表，像论文）。默认开。 */
   addReferences: boolean;
   setAddReferences: (v: boolean) => void;
-  materialSource: 'general' | 'notebook';
-  setMaterialSource: (v: 'general' | 'notebook') => void;
+  materialSource: 'general' | 'knowledge_base' | 'notebook';
+  setMaterialSource: (v: 'general' | 'knowledge_base' | 'notebook') => void;
   /** 不收集素材，直接用通用知识写作：勾选后跳过素材检索阶段（含素材确认暂停点）。默认关。 */
   skipResearch: boolean;
   setSkipResearch: (v: boolean) => void;
@@ -75,7 +75,7 @@ export function WritingFormProvider({
   initialDocumentIds,
 }: {
   children: ReactNode;
-  initialMaterialSource?: 'general' | 'notebook';
+  initialMaterialSource?: 'general' | 'knowledge_base' | 'notebook';
   initialNotebookId?: number | null;
   initialDocumentIds?: number[];
 }) {
@@ -88,7 +88,7 @@ export function WritingFormProvider({
   const [audience, setAudience] = useState('普通读者');
   const [strictMode, setStrictMode] = useState(false);
   const [addReferences, setAddReferences] = useState(true);
-  const [materialSource, setMaterialSource] = useState<'general' | 'notebook'>(initialMaterialSource ?? 'general');
+  const [materialSource, setMaterialSource] = useState<'general' | 'knowledge_base' | 'notebook'>(initialMaterialSource ?? 'general');
   const [skipResearch, setSkipResearch] = useState(false);
   const [selectedNotebookId, setSelectedNotebookId] = useState<number | null>(initialNotebookId ?? null);
   const [selectedDocumentIds, setSelectedDocumentIds] = useState<number[]>(initialDocumentIds ?? []);
@@ -105,8 +105,10 @@ export function WritingFormProvider({
     if (payload.target_audience?.trim()) setAudience(payload.target_audience.trim());
     if (payload.writing_mode === 'strict') setStrictMode(true);
     else if (payload.writing_mode === 'loose') setStrictMode(false);
-    // 旧值 skill / knowledge_base 已合并为通用检索 general
-    if (payload.material_source === 'skill' || payload.material_source === 'knowledge_base' || payload.material_source === 'general') {
+    // knowledge_base=知识库检索（直连内网 ES）保留；旧值 skill 归一为通用检索 general
+    if (payload.material_source === 'knowledge_base') {
+      setMaterialSource('knowledge_base');
+    } else if (payload.material_source === 'skill' || payload.material_source === 'general') {
       setMaterialSource('general');
     }
     if (payload.outline?.trim()) {

frontend-web/src/open-canvas/types/ai-writing.ts

@@ -265,8 +265,9 @@ export interface AIWritingRequest {
   writingMode: "strict" | "loose";
   /** 是否在成稿里加参考文献（正文 [n] 角标 + 文末「参考文献」列表，像论文）。默认 true。 */
   addReferences?: boolean;
-  /** 检索类型：general=通用检索（素材收集专家按配置技能检索，默认知识库检索技能）/ notebook=我的空间 */
-  materialSource: "general" | "notebook";
+  /** 检索类型：general=通用检索（素材收集专家按配置技能检索，默认知识库检索技能）/
+   *  knowledge_base=知识库检索（直连内网知识库 ES 接口，不走技能编排）/ notebook=我的空间 */
+  materialSource: "general" | "knowledge_base" | "notebook";
   /** 不收集素材，直接用通用知识写作：勾选后跳过整个素材检索流程（含素材确认暂停点），
    *  直接进入大纲规划；后端强制 loose 写作模式。默认 false。 */
   skipResearch?: boolean;