feat: 后端 CRUD 完成（episodes + yearly_targets + users 管理 API）

backend/app/api/episodes.py

@@ -0,0 +1,82 @@
+"""
+节目期次 API — 增改查（责编和管理员可操作）
+"""
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlmodel import Session, select
+
+from app.core.deps import get_current_user, require_role
+from app.db.session import get_session
+from app.models.user import User, UserRole
+from app.schemas.episode import EpisodeCreate, EpisodeResponse, EpisodeUpdate
+
+router = APIRouter(prefix="/api/episodes", tags=["节目期次"])
+
+
+@router.get("", response_model=list[EpisodeResponse])
+def list_episodes(
+    limit: int = 50,
+    offset: int = 0,
+    session: Session = Depends(get_session),
+    current_user: User = Depends(require_role(UserRole.zhipianren, UserRole.zebian)),
+):
+    """获取节目期次列表（仅管理员/责编）。按播出日期倒序。"""
+    statement = select(Episode).order_by(Episode.air_date.desc()).offset(offset).limit(limit)
+    episodes = session.exec(statement).all()
+    return episodes
+
+
+@router.get("/{episode_id}", response_model=EpisodeResponse)
+def get_episode(
+    episode_id: int,
+    session: Session = Depends(get_session),
+    current_user: User = Depends(require_role(UserRole.zhipianren, UserRole.zebian)),
+):
+    """根据 ID 获取单期节目（仅管理员/责编）。"""
+    episode = session.get(Episode, episode_id)
+    if episode is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="期次不存在")
+    return episode
+
+
+@router.post("", response_model=EpisodeResponse, status_code=status.HTTP_201_CREATED)
+def create_episode(
+    body: EpisodeCreate,
+    session: Session = Depends(get_session),
+    current_user: User = Depends(require_role(UserRole.zhipianren, UserRole.zebian)),
+):
+    """新增一期节目（仅管理员/责编）。"""
+    # 检查期次号唯一
+    existing = session.exec(
+        select(Episode).where(Episode.episode_number == body.episode_number)
+    ).first()
+    if existing:
+        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="期次号已存在")
+
+    episode = Episode.model_validate(body.model_dump())
+    session.add(episode)
+    session.commit()
+    session.refresh(episode)
+    return episode
+
+
+@router.patch("/{episode_id}", response_model=EpisodeResponse)
+def update_episode(
+    episode_id: int,
+    body: EpisodeUpdate,
+    session: Session = Depends(get_session),
+    current_user: User = Depends(require_role(UserRole.zhipianren, UserRole.zebian)),
+):
+    """更新一期节目信息（仅管理员/责编）。"""
+    episode = session.get(Episode, episode_id)
+    if episode is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="期次不存在")
+
+    update_data = body.model_dump(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(episode, field, value)
+
+    session.add(episode)
+    session.commit()
+    session.refresh(episode)
+    return episode