feat(smzdm): add hot/detail read commands and favorite/zhi write ops

[yixin-1024]

Summary

Extends the 什么值得买 (smzdm) browser adapter beyond search, with all selectors verified live against the logged-in site and full unit coverage.

Reads

• hot — curated home deals feed (/jingxuan/). Reuses the search feed extractor (identical li.feed-row-wide markup).
• detail <id|url> — deal detail: title, price, optional go.smzdm.com buy link, canonical URL. Accepts a bare deal id, /p/<id>/ path, or full www.smzdm.com / post.smzdm.com URL.

Writes (Strategy.UI)

• favorite <id|url> — collect a deal via .fav.J_zhi_like_fav; idempotent (detects the already-favorited active state).
• zhi <id|url> [--down] — rate a deal 值 (default) / 不值. Confirms via the up-count bump. smzdm exposes no reliable on-load rated state, so an unconfirmed re-vote is reported honestly rather than as a false success.

Refactor

Shared feed extractor + limit/URL validation + FEED_COLUMNS moved to clis/smzdm/shared.js; search.js reuses them (behavior unchanged). The mall selector now also handles the home-feed shape where the mall is an <a> link rather than a nested <span>, so the update-time no longer leaks into mall.

Not included

No checkin command: the smzdm web sign-in endpoint (zhiyou.smzdm.com/user/checkin/jsonp_checkin) is captcha-gated (error_code 110202) and cannot be automated headlessly.

Validation (per CONTRIBUTING)

• npx tsc --noEmit — clean
• npm test — 542 files / 5682 tests pass, 0 failures
• cli-manifest.json regenerated (additive; each command carries an example)
• Adapter docs updated: docs/adapters/browser/smzdm.md + docs/adapters/index.md (sidebar already lists SMZDM)
• End-to-end verified via the CLI incl. -f json: hot, detail, favorite, zhi

Adapters are authored in .js to match the post-#928 adapter layer (every sibling adapter is .js).