feat(site): add openstaxToSite to --import-structure

[SanikaA3]

Refs haxtheweb/issues#2912 — step 3 of 3 from the implementation plan. The converter and its dispatcher case merged in haxtheweb/haxcms-nodejs#40, which closed the issue, but steps 2 and 3 were never done. This is the CLI half; the dashboard half is haxtheweb/webcomponents#828.

What was missing

hax site --import-site https://openstax.org/details/books/college-success-concise \
  --import-structure openstaxToSite --name college-success --y --no-i

openstaxToSite had no entry in IMPORT_STRUCTURE_MAP, so the name fell through to the hidden-methodologies branch and the command silently did nothing — no import, no error.

What this does

• src/lib/programs/site.js — maps openstaxToSite to the site/import/:platform dispatcher case openstax, the same in-process on-prem route call the other platform converters make, so no server and no external service are involved.
• src/create.js — lists it in the --import-structure help for both commands. xlsxToSite was mapped but missing from that help, so it is listed now too.
• src/docs/hax.1 — the same two additions in the man page.
• IMPORT_STRUCTURE_MAP is exported so the wiring can be asserted from tests.

Tests

test/unit/site-imports.test.cjs (4 tests) pins the wiring:

• every platform importer maps to its dispatcher platform, openstaxToSite included;
• openstaxToSite resolves to the openstax case;
• docxToSite and xlsxToSite keep their own action routes;
• every mapped importer appears in both the --import-structure help and the man page — the drift that let the OpenStax importer ship unreachable and left xlsxToSite undocumented.

check	result
npm run test:unit	132 passed, 0 failed (4 new)
npm run test:smoke	15 skipped, as on a clean checkout

Removing the map entry fails two of the new tests; removing the name from either the help text or the man page fails the drift test. (node_modules was absent in my checkout, so the suite needs npm ci before it runs at all.)

One dependency note

The CLI reaches the converter through the published @haxtheweb/haxcms-nodejs, and the version this repo installs today (26.8.1) predates the converter, so this path starts working once a release carrying haxtheweb/haxcms-nodejs#40 is out. The dashboard half has no such wait: it calls the running instance's own route.

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