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

constraints/python312-direct.txt

@@ -0,0 +1,12 @@
+# Reference direct-dependency set for CPython 3.12.
+#
+# This intentionally pins only packages imported or invoked directly by the
+# application. In particular, it does not pin uvicorn[standard]'s optional,
+# platform-dependent transitive dependencies. Regenerate and validate these
+# pins in a clean CPython 3.12 environment when intentionally upgrading them.
+fastapi==0.141.1
+lxml==6.1.1
+numpy==2.5.2
+pydantic==2.13.4
+scipy==1.18.0
+uvicorn==0.52.3