feat: 当月热门笑话 + 统计面板，删除首页清除筛选按钮

- 后端新增 GET /api/jokes/hot-monthly（当月浏览量 top 10）
- 后端新增 GET /api/jokes/stats（公开统计：总数/审核/待审/浏览等）
- 右侧栏热门改为当月热门笑话
- 右侧栏新增网站统计区（笑话总数/已审核/待审核/总浏览）
- 首页删除清除筛选按钮

api/app/routers/jokes.py

@@ -1,5 +1,6 @@
 import json
 import random
+from datetime import datetime
 
 from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy import func, text
@@ -161,26 +162,6 @@ def list_jokes(
     )
 
 
-@router.get("/{joke_id}", response_model=JokeResponse)
-def get_joke(joke_id: int, db: Session = Depends(get_db)):
-    """获取单条笑话详情"""
-    # 只返回已审核通过的笑话
-    joke = db.query(Joke).filter(
-        Joke.id == joke_id,
-        Joke.status == "approved"
-    ).first()
-    if not joke:
-        raise HTTPException(status_code=404, detail="笑话不存在")
-    # 使用原子更新避免并发竞态
-    db.query(Joke).filter(Joke.id == joke_id).update({Joke.view_count: Joke.view_count + 1})
-    db.commit()
-    # 重新查询获取更新后的数据
-    db.refresh(joke)
-    # 批量加载类型和人群名称
-    type_map, crowd_map = _batch_load_categories(db, [joke])
-    return joke_to_response(joke, type_map, crowd_map)
-
-
 @router.get("/random", response_model=JokeResponse)
 def get_random_joke(db: Session = Depends(get_db)):
     """随机获取一条已审核通过的笑话"""
@@ -208,6 +189,66 @@ def get_random_joke(db: Session = Depends(get_db)):
     return joke_to_response(joke, type_map, crowd_map)
 
 
+@router.get("/hot-monthly")
+def hot_monthly_jokes(db: Session = Depends(get_db)):
+    """当月热门笑话：本月浏览量最高的前 10 条"""
+    now = datetime.now()
+    start_of_month = now.replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+    jokes = (
+        db.query(Joke)
+        .filter(
+            Joke.status == "approved",
+            Joke.created_at >= start_of_month,
+        )
+        .order_by(Joke.view_count.desc())
+        .limit(10)
+        .all()
+    )
+    type_map, crowd_map = _batch_load_categories(db, jokes)
+    return [joke_to_response(j, type_map, crowd_map) for j in jokes]
+
+
+@router.get("/stats")
+def public_stats(db: Session = Depends(get_db)):
+    """公开统计数据：笑话总数、审核/待审/拒绝数量、总浏览/赞/踩"""
+    total = db.query(Joke).count()
+    approved = db.query(Joke).filter(Joke.status == "approved").count()
+    pending = db.query(Joke).filter(Joke.status == "pending").count()
+    rejected = db.query(Joke).filter(Joke.status == "rejected").count()
+    total_views = db.query(Joke).with_entities(func.sum(Joke.view_count)).scalar() or 0
+    total_likes = db.query(Joke).with_entities(func.sum(Joke.like_count)).scalar() or 0
+    total_dislikes = db.query(Joke).with_entities(func.sum(Joke.dislike_count)).scalar() or 0
+    return {
+        "total_jokes": total,
+        "approved_jokes": approved,
+        "pending_jokes": pending,
+        "rejected_jokes": rejected,
+        "total_views": total_views,
+        "total_likes": total_likes,
+        "total_dislikes": total_dislikes,
+    }
+
+
+@router.get("/{joke_id}", response_model=JokeResponse)
+def get_joke(joke_id: int, db: Session = Depends(get_db)):
+    """获取单条笑话详情"""
+    # 只返回已审核通过的笑话
+    joke = db.query(Joke).filter(
+        Joke.id == joke_id,
+        Joke.status == "approved"
+    ).first()
+    if not joke:
+        raise HTTPException(status_code=404, detail="笑话不存在")
+    # 使用原子更新避免并发竞态
+    db.query(Joke).filter(Joke.id == joke_id).update({Joke.view_count: Joke.view_count + 1})
+    db.commit()
+    # 重新查询获取更新后的数据
+    db.refresh(joke)
+    # 批量加载类型和人群名称
+    type_map, crowd_map = _batch_load_categories(db, [joke])
+    return joke_to_response(joke, type_map, crowd_map)
+
+
 def _vote_joke(joke_id: int, field: str, db: Session):
     """通用投票逻辑：点赞或点踩（仅允许已审核通过的笑话）"""
     joke = db.query(Joke).filter(