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>

requirements.txt

@@ -0,0 +1,36 @@
+# TimeLine Designer - Python Dependencies
+# Version: 1.0.0
+
+# Web Framework
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+python-multipart==0.0.6
+
+# Data Validation
+pydantic==2.5.0
+
+# Data Processing
+pandas==2.1.3
+openpyxl==3.1.2
+
+# Visualization
+plotly==6.1.1
+kaleido==1.2.0
+
+# GUI Container
+pywebview==4.4.1
+
+# Testing
+pytest==7.4.3
+pytest-asyncio==0.21.1
+pytest-cov==4.1.0
+pytest-benchmark==4.0.0
+playwright==1.40.0
+
+# Code Quality
+flake8==6.1.0
+mypy==1.7.1
+bandit==1.7.5
+
+# Utilities
+python-dateutil==2.8.2