feat(settings): 公司信息配置与 logo 管理（public 端点供登录页）

- system_settings 单行 CRUD：GET/PUT（AdminUser）+ GET /public（无鉴权， SettingPublicOut 白名单仅 company_name/logo_url 两字段，短缓存 300s） - logo 上传：后缀+magic bytes+2MB 三重校验，固定名覆盖落盘 uploads/logo/ （不使用上传方文件名，杜绝路径拼接）；旧扩展名文件清理；文件流端点 no-cache，URL 带 update_time 版本参数破缓存 - logo 存目录不存库：图片入 DB 让每次读取与 mysqldump 放大传输且无法独立替换；DB 只持一行相对路径 - 新增依赖 python-multipart（FastAPI UploadFile 必备传输层）；.gitignore 增 backend/uploads/ 与 db/backups/ - 集成 11 例：单行语义/白名单字段/三重校验/越权 403/匿名 401/审计留痕 Co-Authored-By: Claude Code <noreply@anthropic.com>
2026-10-15 18:22:12 +08:00
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+"""系统设置（公司信息）接口测试。
+
+守的是：
+- 单行语义：全系统恒一行，PUT 只改名称不增行
+- public 端点无鉴权可用但**白名单字段**——多一个敏感字段都是匿名泄漏
+- logo 上传三重校验（后缀/magic bytes/大小）——仅看后缀可被伪造
+- 审计留痕：系统设置属敏感配置，改必须有日志
+
+真图片构造：PNG 用 8 字节签名 + 最小 IHDR；JPG 用 SOI 头 + 填充字节。
+仅校验 magic bytes 前缀，无需完整合法图片（解析由前端 img 完成）。
+"""
+
+import uuid
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.main import app
+
+pytestmark = pytest.mark.integration
+
+_SETTINGS = "/api/v1/system/settings"
+
+_PNG_BYTES = b"\x89PNG\r\n\x1a\n" + b"\x00" * 32
+_JPG_BYTES = b"\xff\xd8\xff\xe0" + b"\x00" * 32
+_TXT_BYTES = b"not an image at all"
+
+
+@pytest.fixture
+def client() -> TestClient:
+    return TestClient(app)
+
+
+class TestCompanyInfo:
+    """公司名称读取与更新。"""
+
+    def test_初始值与更新生效(self, client: TestClient, admin: dict) -> None:
+        got = client.get(_SETTINGS, headers=admin["headers"]).json()["data"]
+        assert got["company_name"]
+        # logo_url 允许为 None（未上传）或历史遗留的 URL——单行库可复用，
+        # 断言不依赖「干净库」前提；上传行为由 TestLogoUpload 专类覆盖
+        assert got["logo_url"] is None or "/logo/public" in got["logo_url"]
+
+        new_name = f"测试公司_{uuid.uuid4().hex[:6]}"
+        put = client.put(_SETTINGS, json={"company_name": new_name}, headers=admin["headers"])
+        assert put.status_code == 200, put.text
+        assert put.json()["data"]["company_name"] == new_name
+        assert (
+            client.get(_SETTINGS, headers=admin["headers"]).json()["data"]["company_name"]
+            == new_name
+        )
+
+    def test_名称为空被拒(self, client: TestClient, admin: dict) -> None:
+        assert (
+            client.put(_SETTINGS, json={"company_name": ""}, headers=admin["headers"]).status_code
+            == 400
+        )
+
+    def test_非管理员改名称被拒(self, client: TestClient, normal: dict) -> None:
+        resp = client.put(_SETTINGS, json={"company_name": "越权公司"}, headers=normal["headers"])
+        assert resp.status_code == 403
+
+    def test_修改留审计日志(self, client: TestClient, admin: dict) -> None:
+        client.put(
+            _SETTINGS,
+            json={"company_name": f"审计公司_{uuid.uuid4().hex[:6]}"},
+            headers=admin["headers"],
+        )
+        logs = client.get(
+            "/api/v1/system/operation-logs",
+            params={"module": "系统设置"},
+            headers=admin["headers"],
+        ).json()["data"]["list"]
+        assert logs, "修改公司名称未产生操作日志"
+
+
+class TestPublicEndpoint:
+    """匿名端点：白名单字段 + 可用性。"""
+
+    def test_无令牌可读且仅白名单字段(self, client: TestClient, admin: dict) -> None:
+        name = f"公开公司_{uuid.uuid4().hex[:6]}"
+        client.put(_SETTINGS, json={"company_name": name}, headers=admin["headers"])
+
+        resp = client.get(f"{_SETTINGS}/public")
+        assert resp.status_code == 200
+        data = resp.json()["data"]
+        assert set(data) == {"company_name", "logo_url"}, "public 端点字段越界"
+        assert data["company_name"] == name
+        assert resp.headers.get("cache-control") is not None
+
+    def test_写操作匿名不可用(self, client: TestClient) -> None:
+        assert client.put(f"{_SETTINGS}/public", json={"company_name": "x"}).status_code in {
+            401,
+            405,
+        }
+
+
+class TestLogoUpload:
+    """logo 上传校验链。"""
+
+    def _upload(self, client: TestClient, admin: dict, filename: str, content: bytes):
+        return client.post(
+            f"{_SETTINGS}/logo",
+            files={"file": (filename, content, "application/octet-stream")},
+            headers=admin["headers"],
+        )
+
+    def test_合法png上传成功且回读(self, client: TestClient, admin: dict) -> None:
+        resp = self._upload(client, admin, "logo.png", _PNG_BYTES)
+        assert resp.status_code == 200, resp.text
+        out = resp.json()["data"]
+        assert out["logo_url"] and "/logo/public" in out["logo_url"]
+
+        img = client.get(f"{_SETTINGS}/logo/public")
+        assert img.status_code == 200
+        assert img.headers["content-type"] == "image/png"
+
+    def test_伪造扩展名被magic_bytes拦截(self, client: TestClient, admin: dict) -> None:
+        resp = self._upload(client, admin, "fake.png", _TXT_BYTES)
+        assert resp.status_code == 400
+        assert "不符" in resp.json()["message"]
+
+    def test_非法格式被拒(self, client: TestClient, admin: dict) -> None:
+        assert self._upload(client, admin, "x.gif", _PNG_BYTES).status_code == 400
+
+    def test_超限被拒(self, client: TestClient, admin: dict) -> None:
+        big = _PNG_BYTES + b"\x00" * (2 * 1024 * 1024)
+        resp = self._upload(client, admin, "big.png", big)
+        assert resp.status_code == 400
+        assert "2MB" in resp.json()["message"]
+
+    def test_匿名上传被拒(self, client: TestClient) -> None:
+        resp = client.post(
+            f"{_SETTINGS}/logo",
+            files={"file": ("logo.png", _PNG_BYTES, "application/octet-stream")},
+        )
+        assert resp.status_code == 401