v9.5: 實作標籤完全不重疊算法

- 新增 _calculate_lane_conflicts_v2() 分開返回標籤重疊和線穿框分數
- 修改泳道選擇算法，優先選擇無標籤重疊的泳道
- 兩階段搜尋：優先側別無可用泳道則嘗試另一側
- 增強日誌輸出，顯示標籤範圍和詳細衝突分數

🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

tests/unit/test_schemas.py

@@ -0,0 +1,146 @@
+"""
+資料模型測試
+
+測試 Pydantic schemas 的基本驗證功能
+
+Version: 1.0.0
+DocID: TDD-UT-SCHEMA-001
+"""
+
+import pytest
+from datetime import datetime
+from backend.schemas import Event, EventType, TimelineConfig, ExportOptions, ExportFormat
+
+
+class TestEventModel:
+    """Event 模型測試"""
+
+    def test_create_valid_event(self):
+        """測試建立有效事件"""
+        event = Event(
+            id="test-001",
+            title="測試事件",
+            start=datetime(2024, 1, 1, 9, 0, 0),
+            end=datetime(2024, 1, 1, 17, 0, 0),
+            group="Phase 1",
+            description="這是一個測試事件",
+            color="#3B82F6",
+            event_type=EventType.RANGE
+        )
+
+        assert event.id == "test-001"
+        assert event.title == "測試事件"
+        assert event.group == "Phase 1"
+        assert event.color == "#3B82F6"
+
+    def test_event_end_before_start_validation(self):
+        """測試結束時間早於開始時間的驗證"""
+        with pytest.raises(ValueError, match="結束時間必須晚於開始時間"):
+            Event(
+                id="test-002",
+                title="無效事件",
+                start=datetime(2024, 1, 2, 9, 0, 0),
+                end=datetime(2024, 1, 1, 9, 0, 0),  # 結束早於開始
+            )
+
+    def test_event_with_invalid_color(self):
+        """測試無效的顏色格式"""
+        with pytest.raises(ValueError):
+            Event(
+                id="test-003",
+                title="測試事件",
+                start=datetime(2024, 1, 1, 9, 0, 0),
+                color="invalid-color"  # 無效的顏色格式
+            )
+
+    def test_event_optional_fields(self):
+        """測試可選欄位"""
+        event = Event(
+            id="test-004",
+            title="最小事件",
+            start=datetime(2024, 1, 1, 9, 0, 0)
+        )
+
+        assert event.end is None
+        assert event.group is None
+        assert event.description is None
+        assert event.color is None
+
+
+class TestTimelineConfig:
+    """TimelineConfig 模型測試"""
+
+    def test_default_config(self):
+        """測試預設配置"""
+        config = TimelineConfig()
+
+        assert config.direction == 'horizontal'
+        assert config.theme.value == 'modern'
+        assert config.show_grid is True
+        assert config.show_tooltip is True
+
+    def test_custom_config(self):
+        """測試自訂配置"""
+        config = TimelineConfig(
+            direction='vertical',
+            theme='classic',
+            show_grid=False
+        )
+
+        assert config.direction == 'vertical'
+        assert config.theme.value == 'classic'
+        assert config.show_grid is False
+
+
+class TestExportOptions:
+    """ExportOptions 模型測試"""
+
+    def test_valid_export_options(self):
+        """測試有效的匯出選項"""
+        options = ExportOptions(
+            fmt=ExportFormat.PDF,
+            dpi=300,
+            width=1920,
+            height=1080
+        )
+
+        assert options.fmt == ExportFormat.PDF
+        assert options.dpi == 300
+        assert options.width == 1920
+        assert options.height == 1080
+
+    def test_dpi_range_validation(self):
+        """測試 DPI 範圍驗證"""
+        # DPI 太低
+        with pytest.raises(ValueError):
+            ExportOptions(
+                fmt=ExportFormat.PNG,
+                dpi=50  # < 72
+            )
+
+        # DPI 太高
+        with pytest.raises(ValueError):
+            ExportOptions(
+                fmt=ExportFormat.PNG,
+                dpi=700  # > 600
+            )
+
+    def test_dimension_validation(self):
+        """測試尺寸範圍驗證"""
+        # 寬度太小
+        with pytest.raises(ValueError):
+            ExportOptions(
+                fmt=ExportFormat.PNG,
+                width=500  # < 800
+            )
+
+        # 高度太大
+        with pytest.raises(ValueError):
+            ExportOptions(
+                fmt=ExportFormat.PNG,
+                height=5000  # > 4096
+            )
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])