重构表结构：合并 profiles→users，展平 API 响应，新增计数器字段

- models: 删除 Profile 模型，字段合并到 User；User 新增云朵/公开/收藏计数器；Cloud 新增 favorite_count
- schemas/serializers: 展平 UserOut/AuthOut/MeOut/AdminUserOut，移除嵌套 profile
- deps: user.profile.role→user.role，移除 selectinload profile
- auth/register: 注册时直接设置 user 字段，不再创建 Profile
- clouds: 创建/删除云朵时同步 user.cloud_count 计数器，状态变化时同步 public_cloud_count
- favorites: 点赞/取消时同步 cloud.favorite_count 计数器
- admin: 审批/隐藏/批量删时同步 public_cloud_count 计数器
- profiles/stats: 用计数器替代实时 COUNT 查询
- alembic: 新增 migration 合并 profiles 到 users，初始化 counters

app/seed.py

@@ -5,7 +5,7 @@ from sqlalchemy.orm import selectinload
 
 from app.config import settings
 from app.database import SessionLocal
-from app.models import CloudType, Profile, User
+from app.models import CloudType, User
 from app.security import hash_password, utc_now
 
 
@@ -36,20 +36,21 @@ async def seed() -> None:
         if settings.admin_email and settings.admin_password:
             email = settings.admin_email.strip().lower()
             result = await db.execute(
-                select(User).options(selectinload(User.profile)).where(User.email == email)
+                select(User).where(User.email == email)
             )
             admin = result.scalar_one_or_none()
             if admin:
-                admin.profile.role = "admin"
-                admin.profile.is_disabled = False
+                admin.role = "admin"
+                admin.is_disabled = False
                 admin.email_verified_at = admin.email_verified_at or utc_now()
             else:
                 admin = User(
                     email=email,
                     password_hash=hash_password(settings.admin_password),
                     email_verified_at=utc_now(),
+                    username=settings.admin_username,
+                    role="admin",
                 )
-                admin.profile = Profile(username=settings.admin_username, role="admin")
                 db.add(admin)
         await db.commit()