fix(landing): redirect /privacy → /policy (unblock CWS extension publish)

[Smetools]

Why

Chrome Web Store has `https://knowcap.ai/privacy\` registered as the
Knowcap extension's privacy URL, but the page lives at `/policy`.
Google's publish-time reachability check 404s and blocks every
extension publish with:

```
"Publish condition not met: Privacy policy link is not reachable."
```

Has blocked every extension publish since 1.21.6 (May 6). 1.21.19 is
currently sitting unpublished in the CWS dashboard.

Previously merged into `master` as #4 — but Vercel deploys from
`main` (per #3's commit message: "master has been a broken dev fork
for 2 months"). Re-targeting at `main` so the redirect actually
ships.

Fix

Permanent redirects `/privacy` and `/privacy-policy` → `/policy` in
`next.config.js`. Both URLs return 200 via 308.

Test plan

• After Vercel auto-deploys, `curl -sSL -o /dev/null -w "%{http_code}\n" https://knowcap.ai/privacy\` returns 200.
• Re-run `gh workflow run extension-publish-debug.yml --repo Knowcap-V2/knowcap -F target=default` — POST publish step returns HTTP 200.
• CWS update endpoint reports 1.21.19 within minutes.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
app	Building	Preview, Comment	May 17, 2026 11:32pm

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