我们改了很多代码，现在的 docs/PRD.md 是否能跟代码对得上？请用 think 工具规划一下要查哪些点，再去交叉验证。

[Workflow rule: before asserting any fact about code behaviour or values, grep/read the source to confirm. Do not rely on memory from earlier turns. No grep/read evidence → label it a guess.]
