test(wave191): 补全direct_construction测试用例，增加完整构造场景

- 拆分test_direct_construction为minimal和full两个用例
- minimal用例验证默认值行为
- full用例验证所有字段均可独立赋值
- 新增EditingMode导入

tests/unit/domain/test_edit_template.py

@@ -4,6 +4,7 @@ from datetime import datetime, timezone
 
 import pytest
 from domain.edit_template import EditTemplate, EditTemplateStatus
+from domain.editing_mode import EditingMode
 
 # ── EditTemplateStatus 枚举 ──────────────────────────────────────────────────
 
@@ -212,8 +213,8 @@ class TestEditTemplateBasics:
         with pytest.raises(AttributeError):
             t.nonexistent_field = "value"
 
-    def test_direct_construction(self):
-        # 可以直接构造（绕过 create 的校验）
+    def test_direct_construction_minimal(self):
+        # 最小构造：仅必填字段 + 状态，其余走默认值
         t = EditTemplate(
             id="custom_id",
             name="直接构造",
@@ -221,6 +222,44 @@ class TestEditTemplateBasics:
         )
         assert t.id == "custom_id"
         assert t.name == "直接构造"
+        assert t.status == EditTemplateStatus.ACTIVE
+        # 默认值检查
+        assert t.description == ""
+        assert t.config == {}
+        assert t.version == 1
+        assert t.editing_mode == EditingMode.ONE_TAKE.value
+        assert isinstance(t.created_at, datetime)
+        assert isinstance(t.updated_at, datetime)
+
+    def test_direct_construction_full(self):
+        # 完整构造：所有字段都传
+        now = datetime(2025, 1, 1, tzinfo=timezone.utc)
+        t = EditTemplate(
+            id="full_id",
+            name="完整构造",
+            description="测试描述",
+            template_type="custom",
+            editing_mode=EditingMode.PIP.value,
+            config={"key": "value"},
+            preview_url="https://example.com/preview.jpg",
+            sort_weight=100,
+            status=EditTemplateStatus.INACTIVE,
+            version=3,
+            created_at=now,
+            updated_at=now,
+        )
+        assert t.id == "full_id"
+        assert t.name == "完整构造"
+        assert t.description == "测试描述"
+        assert t.template_type == "custom"
+        assert t.editing_mode == EditingMode.PIP.value
+        assert t.config == {"key": "value"}
+        assert t.preview_url == "https://example.com/preview.jpg"
+        assert t.sort_weight == 100
+        assert t.status == EditTemplateStatus.INACTIVE
+        assert t.version == 3
+        assert t.created_at == now
+        assert t.updated_at == now
 
     def test_config_is_independent(self):
         # 不同实例的 config 应该是独立的 dict