refactor(core): 脚本收口——只留 agent 出稿,删旧散文路 + 单镜重跑改走 agent

删 /generate-script/ 端点 + generate_project_script + build_script_prompt + 旧单镜 build_segment_rerun_prompt;前端删静默兜底(agent 失败明确报错,不再掉回旧路)+ onGenerateScript prop/api。rerun-script-segment 改用 agent 单镜逻辑(regenerate_segment_via_agent:读全脚本上下文/保留其余镜/落新版本)。根因:旧路不产 script_entities/entity_refs,下游故事板/视频参考图断线→图飘。测试:删 3 个旧 generate 用例 + 重写 rerun 为 agent 版,ai+projects 23 测试除 4 个既有 base-asset 失败外全绿。

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

core/frontend/src/App.tsx

@@ -748,9 +748,7 @@ export function App() {
         notice={notice}
         unreadCount={unreadCount}
         avatarChar={avatarChar}
-        logout={logout}
-        onGenerateScript={(prompt, source) => action(() => api.generateScript(pipelineProject.id, { prompt, source }), "脚本已生成")}
-        onAdoptScript={(scriptId) => action(() => api.adoptScript(pipelineProject.id, scriptId), "脚本已采用")}
+        logout={logout}        onAdoptScript={(scriptId) => action(() => api.adoptScript(pipelineProject.id, scriptId), "脚本已采用")}
         onUpdateShot={(payload) => action(() => api.updateScriptSegment(pipelineProject.id, payload), "分镜已更新")}
         onAddShot={(afterSegmentId) => action(() => api.addScriptSegment(pipelineProject.id, { after_segment_id: afterSegmentId }), "分镜已添加")}
         onDeleteShot={(segmentId) => action(() => api.deleteScriptSegment(pipelineProject.id, { segment_id: segmentId }), "分镜已删除")}

core/frontend/src/api.ts

@@ -223,12 +223,6 @@ export const api = {
   deleteProject(id: string) {
     return request<void>(`/api/projects/${id}/`, { method: "DELETE" });
   },
-  generateScript(projectId: string, payload: { prompt: string; source?: string; selling_point_ids?: string[] }) {
-    return request<ScriptVersion>(`/api/projects/${projectId}/generate-script/`, {
-      method: "POST",
-      body: JSON.stringify(payload)
-    });
-  },
   // 对话式脚本 agent · 流式(SSE)。逐帧回调 onEvent:tool(工具卡)/delta(思考前言)/draft/saved/done/error。
   // 用 fetch + ReadableStream 消费 text/event-stream(EventSource 只支持 GET,这里要 POST 带 body)。
   async agentScriptStream(

core/frontend/src/routes/pipeline.tsx

@@ -422,9 +422,7 @@ export function PipelinePage(props: {
   avatarChar: string;
   logout: () => void;
   scriptModelName: string;
-  textModels?: ModelConfig[];
-  onGenerateScript: (prompt: string, source?: string) => Promise<unknown>;
-  onAdoptScript: (scriptId: string) => void | Promise<unknown>;
+  textModels?: ModelConfig[];  onAdoptScript: (scriptId: string) => void | Promise<unknown>;
   onUpdateShot: (payload: { segment_id: string; narration?: string; visual_prompt?: string; duration_seconds?: number }) => Promise<unknown>;
   onAddShot: (afterSegmentId: string) => Promise<unknown>;
   onDeleteShot: (segmentId: string) => Promise<unknown>;
@@ -460,7 +458,7 @@ export function PipelinePage(props: {
 }) {
   const {
     project, loading, navigate, user, team, products, projects, assets, billing, notice, unreadCount, avatarChar, logout,
-    scriptModelName, textModels, onGenerateScript, onAdoptScript, onUpdateShot, onAddShot, onDeleteShot, onRerunShot, onSaveProjectMeta, onAdoptVideoVersion, onGenerateVoiceover,
+    scriptModelName, textModels, onAdoptScript, onUpdateShot, onAddShot, onDeleteShot, onRerunShot, onSaveProjectMeta, onAdoptVideoVersion, onGenerateVoiceover,
     onGenerateBaseAsset, onAdoptBaseAsset, onAttachBaseAsset, onGenerateActor, onUploadActor, onGenerateTriview, onRenameActor, onGenerateStoryboard, onSkipStoryboard,
     onSubmitVideo, onSubmitAllVideos, onPollVideosQuiet, exportResult, onRefreshExport, onRefreshProject,
     onUploadVideoSegment, onUploadBgm, onSaveTimeline, onSubmitExport
@@ -929,9 +927,8 @@ export function PipelinePage(props: {
       if (ok) {
         // 已收到 saved:流其实成功了(只是收尾抖动),绝不回退重发,避免重复生成+重复扣费
       } else if (!receivedEvent) {
-        // 一个事件都没收到 = 流式根本没跑起来(网关不支持 SSE)→ 退回旧同步端点
-        const res = await onGenerateScript(prompt, source ?? chatMode).catch(() => null);
-        ok = !!res;
+        // 流式没跑起来:明确报错,不再静默退回旧散文路(旧路不产 script_entities,会让下游故事板/视频参考图断线)
+        pushMsg("ai", "脚本生成没能启动(流式连接失败),请重试。");
       } else {
         // 流中途断了(后端已通过 finally 释放预扣额度):不重试,提示用户
         pushMsg("ai", "生成中断了,请重试。");