完善通用求解器回归与前端交互

- 引入因果坐标内核、热流体恢复和递进长时回归\n- 完善正交连线、线桥、视图保持与结果曲线缩放\n- 补充依赖约束、CI、测试基线和北京时间更新日志

requirements.txt

@@ -1,4 +1,8 @@
+# Supported dependency ranges. Reproducible Python 3.12 installs should also
+# apply constraints/python312-direct.txt; see README.md.
 fastapi
 lxml>=5,<7
+numpy>=1.26,<3
+pydantic>=2,<3
 scipy>=1.13,<2
 uvicorn[standard]