新增前后端AI聊天模块，包括流式对话、配置管理和UI组件优化。

backend/app/routers/novels.py

@@ -0,0 +1,67 @@
+from datetime import datetime, timezone
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlmodel import Session, select, func
+
+from ..database import get_session
+from ..models import Novel
+from ..schemas import NovelCreate, NovelUpdate, NovelRead, NovelList
+
+router = APIRouter(prefix="/api/novels", tags=["novels"])
+
+
+def _get_novel_or_404(novel_id: int, session: Session) -> Novel:
+    novel = session.get(Novel, novel_id)
+    if not novel:
+        raise HTTPException(status_code=404, detail="小说不存在")
+    return novel
+
+
+@router.get("", response_model=NovelList)
+def list_novels(
+    skip: int = Query(0, ge=0),
+    limit: int = Query(20, ge=1, le=100),
+    session: Session = Depends(get_session),
+):
+    total = session.exec(select(func.count(Novel.id))).one()
+    novels = session.exec(
+        select(Novel).order_by(Novel.updated_at.desc()).offset(skip).limit(limit)
+    ).all()
+    items = [NovelRead.model_validate(n, from_attributes=True) for n in novels]
+    return NovelList(items=items, total=total)
+
+
+@router.post("", response_model=NovelRead, status_code=201)
+def create_novel(data: NovelCreate, session: Session = Depends(get_session)):
+    novel = Novel(**data.model_dump())
+    session.add(novel)
+    session.commit()
+    session.refresh(novel)
+    return novel
+
+
+@router.get("/{novel_id}", response_model=NovelRead)
+def get_novel(novel_id: int, session: Session = Depends(get_session)):
+    return _get_novel_or_404(novel_id, session)
+
+
+@router.patch("/{novel_id}", response_model=NovelRead)
+def update_novel(
+    novel_id: int, data: NovelUpdate, session: Session = Depends(get_session)
+):
+    novel = _get_novel_or_404(novel_id, session)
+    update_data = data.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(novel, key, value)
+    novel.updated_at = datetime.now(timezone.utc)
+    session.add(novel)
+    session.commit()
+    session.refresh(novel)
+    return novel
+
+
+@router.delete("/{novel_id}", status_code=204)
+def delete_novel(novel_id: int, session: Session = Depends(get_session)):
+    novel = _get_novel_or_404(novel_id, session)
+    session.delete(novel)
+    session.commit()