feat: 完成模型训练/评估/Web大屏/LaTeX论文框架

- LSTM-Attention模型(983K参数) + XGBoost基线
- Flask API后端(4端点) + ECharts可视化大屏(6面板)
- LaTeX学位论文完整框架(7章+参考文献)
- ERA5下载脚本(CDS逐月并行下载)
- README项目文档

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -17,3 +17,4 @@ outputs/logs/
 *.fdb_latexmk
 *.fls
 .DS_Store
+.claude/