feat(review): 审稿选章可用——列章端点 + 选章下拉全章可见 + 默认最近章

- 后端新增 GET /projects/{id}/chapters（列真实存在的章 + has_draft/accepted/reviewed_at），TDD 10 测
- gen:api 重生成 TS 客户端（ChapterListItem）
- 选章下拉去掉 hidden（手机/窄屏也可切章）；选项以真实章为准 + 大纲结构，
  无草稿章置灰（仅当前章例外），覆盖『写过但不在大纲』的章
- 无 ?chapter 时默认落到最近一个有草稿的章，而非硬编码第 1 章

apps/api/ww_api/routers/projects.py

@@ -56,6 +56,7 @@ from ww_api.schemas.injection import (
 from ww_api.schemas.projects import (
     AcceptRequest,
     AcceptResponse,
+    ChapterListItem,
     DraftResponse,
     DraftSaveRequest,
     DraftStreamRequest,
@@ -75,10 +76,12 @@ from ww_api.services.accept_service import (
     assert_conflicts_resolved,
     run_accept_transaction,
 )
+from ww_api.services.chapter_list import ChapterLister
 from ww_api.services.credentials import STUB_OWNER_ID
 from ww_api.services.digest_extraction import extract_digest_facts
 from ww_api.services.foreshadow_scan import SessionFactory, run_overdue_scan
 from ww_api.services.project_deps import (
+    get_chapter_lister,
     get_chapter_repo,
     get_clarify_gateway,
     get_digest_append_repo,
@@ -115,6 +118,7 @@ _SSE_RESPONSE: dict[int | str, dict[str, Any]] = {
 
 ProjectRepoDep = Annotated[ProjectRepo, Depends(get_project_repo)]
 ChapterRepoDep = Annotated[ChapterRepo, Depends(get_chapter_repo)]
+ChapterListerDep = Annotated[ChapterLister, Depends(get_chapter_lister)]
 GatewayDep = Annotated[Gateway, Depends(get_writer_gateway)]
 ReviewGatewayDep = Annotated[Gateway, Depends(get_review_gateway)]
 DigestGatewayDep = Annotated[Gateway, Depends(get_digest_gateway)]
@@ -166,6 +170,28 @@ async def get_project(project_id: uuid.UUID, repo: ProjectRepoDep) -> ProjectRes
     return _to_response(view)
 
 
+@router.get("/{project_id}/chapters", responses=_NOT_FOUND)
+async def list_chapters(
+    project_id: uuid.UUID,
+    project_repo: ProjectRepoDep,
+    lister: ChapterListerDep,
+) -> list[ChapterListItem]:
+    """列出该项目「真实存在的章」+ 可审/已审标记（审稿页选章下拉枚举）。
+
+    来源 `chapters`（草稿/accepted）+ `chapter_reviews`，按章号去重升序。只读、不触 LLM。
+    项目不存在 → 404（同其它端点，owner 走 project_repo stub 校验）。
+    """
+    if await project_repo.get(STUB_OWNER_ID, project_id) is None:
+        raise AppError(ErrorCode.NOT_FOUND, f"project {project_id} not found")
+    items = await lister.list_chapters(project_id)
+    log.info(
+        "chapters_listed",
+        project_id=str(project_id),
+        chapter_count=len(items),
+    )
+    return items
+
+
 async def _injection_response(
     repos: MemoryRepos,
     project_id: uuid.UUID,