feat(api): implement FastAPI routes with JWT authentication

- jokes.py: Public joke listing, detail, and random endpoints
- categories.py: Type and crowd listing endpoints
- auth.py: Login endpoint with JWT token generation
- admin.py: Full CRUD for jokes, types, crowds with JWT protection
- Fix request body schemas to use Create DTOs instead of Response models

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

api/app/routers/auth.py

@@ -0,0 +1,39 @@
+from datetime import datetime, timedelta, timezone
+
+from fastapi import APIRouter, Depends, HTTPException
+from jose import jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.config import JWT_ALGORITHM, JWT_EXPIRATION_HOURS, JWT_SECRET_KEY
+from app.database import get_db
+from app.models.user import AdminUser
+from app.schemas.auth import LoginRequest, TokenResponse
+
+router = APIRouter(prefix="/auth", tags=["认证"])
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """验证密码"""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def create_access_token(data: dict) -> str:
+    """创建 JWT token"""
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + timedelta(hours=JWT_EXPIRATION_HOURS)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, JWT_SECRET_KEY, algorithm=JWT_ALGORITHM)
+    return encoded_jwt
+
+
+@router.post("/login", response_model=TokenResponse)
+def login(req: LoginRequest, db: Session = Depends(get_db)):
+    """管理员登录"""
+    user = db.query(AdminUser).filter(AdminUser.username == req.username).first()
+    if not user or not verify_password(req.password, user.password_hash):
+        raise HTTPException(status_code=401, detail="用户名或密码错误")
+    access_token = create_access_token(data={"sub": str(user.id), "username": user.username})
+    return TokenResponse(access_token=access_token)