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

tests/test_admin.py

@@ -71,7 +71,7 @@ def test_create_user(client: TestClient) -> None:
     assert r.status_code == 201
     body = r.json()
     assert body["user"]["email_verified"] is True
-    assert body["profile"]["role"] == "user"
+    assert body["user"]["role"] == "user"
 
 
 def test_create_user_with_role(client: TestClient) -> None:
@@ -87,7 +87,7 @@ def test_create_user_with_role(client: TestClient) -> None:
         },
     )
     assert r.status_code == 201
-    assert r.json()["profile"]["role"] == "admin"
+    assert r.json()["user"]["role"] == "admin"
 
 
 def test_create_user_duplicate_email(client: TestClient) -> None:
@@ -141,7 +141,7 @@ def test_update_user_role(client: TestClient, monkeypatch) -> None:
         json={"role": "admin"},
     )
     assert r.status_code == 200
-    assert r.json()["profile"]["role"] == "admin"
+    assert r.json()["user"]["role"] == "admin"
 
 
 def test_update_user_disable(client: TestClient, monkeypatch) -> None:
@@ -157,7 +157,7 @@ def test_update_user_disable(client: TestClient, monkeypatch) -> None:
         json={"is_disabled": True},
     )
     assert r.status_code == 200
-    assert r.json()["profile"]["is_disabled"] is True
+    assert r.json()["user"]["is_disabled"] is True
 
     client.patch(
         f"/api/v1/admin/users/{info['user_id']}",

tests/test_auth.py

@@ -264,7 +264,7 @@ def test_me(client: TestClient, monkeypatch) -> None:
     assert r.status_code == 200
     body = r.json()
     assert body["user"]["email"] == email
-    assert body["profile"]["username"] == "我的信息"
+    assert body["user"]["username"] == "我的信息"
 
 
 def test_me_unauthenticated(client: TestClient) -> None: