docs(web): mark HeroUI v3 cleanup as complete

[dingyi]

Wrap-up commit. All seven phases tracked in web/TODO.md have shipped
across PRs #9-#13; the in-flight tracker becomes a one-page summary
linking each PR to the phase it closed, plus pointers to the two
idempotent codemods under web/scripts/.

Final compliance scan

$ rg "variant=['\"](solid|bordered|flat|light|faded|shadow)['\"]" web/src/   →  0
$ rg "radius="                                                  web/src/   →  0
$ rg "classNames=\{"                                            web/src/   →  0
$ rg "startContent=|endContent="                                web/src/   →  0
$ rg "from '@/components/(common/ui/Hero|ui/semi)"              web/src/   →  0
$ rg "HeroUIProvider|useDisclosure|useSwitch|useInput|useCheckbox|useRadio"
                                                                web/src/   →  0
$ rg "<Button[^/>]*\bisLoading="                                web/src/   →  0

web/src/components/ui/ retains only ToastViewport.jsx. The
Semi-style adapter layer is gone.

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