feat: 添加 OAuth 认证支持及相关改进

- 新增 OAuth 模块，支持 LinuxDo/GitHub/Google 等第三方登录
- 用户邮箱改为可选字段，支持无邮箱注册
- 新增模块配置验证状态 (config_validated/config_error)
- 系统设置界面改为分块独立保存
- 用户设置新增 OAuth 绑定管理和首次密码设置
- 登录界面支持 OAuth 按钮展示
- 邮箱验证设置移至邮件设置页面

tests/services/test_auth.py

@@ -19,6 +19,8 @@ from src.services.auth.service import (
     JWT_ALGORITHM,
     JWT_EXPIRATION_HOURS,
 )
+from src.core.enums import AuthSource
+from src.models.database import UserRole
 
 
 class TestJWTTokenCreation:
@@ -167,7 +169,10 @@ class TestUserAuthentication:
         mock_user = MagicMock()
         mock_user.id = "user-123"
         mock_user.email = "test@example.com"
+        mock_user.is_deleted = False
         mock_user.is_active = True
+        mock_user.auth_source = AuthSource.LOCAL
+        mock_user.role = UserRole.USER
         mock_user.verify_password.return_value = True
 
         mock_db = MagicMock()
@@ -198,6 +203,10 @@ class TestUserAuthentication:
         """测试密码错误"""
         mock_user = MagicMock()
         mock_user.email = "test@example.com"
+        mock_user.is_deleted = False
+        mock_user.is_active = True
+        mock_user.auth_source = AuthSource.LOCAL
+        mock_user.role = UserRole.USER
         mock_user.verify_password.return_value = False
 
         mock_db = MagicMock()
@@ -212,7 +221,10 @@ class TestUserAuthentication:
         """测试用户已禁用"""
         mock_user = MagicMock()
         mock_user.email = "test@example.com"
+        mock_user.is_deleted = False
         mock_user.is_active = False
+        mock_user.auth_source = AuthSource.LOCAL
+        mock_user.role = UserRole.USER
         mock_user.verify_password.return_value = True
 
         mock_db = MagicMock()
@@ -232,6 +244,7 @@ class TestAPIKeyAuthentication:
         mock_user.id = "user-123"
         mock_user.email = "test@example.com"
         mock_user.is_active = True
+        mock_user.is_deleted = False
 
         mock_api_key = MagicMock()
         mock_api_key.is_active = True