docs(configure): repoint the dead /docs/build/objects link to /docs/build/data

[os-zhuang]

Fixes#99

content/docs/configure/data-sources.mdx:258 linked to /docs/build/objects in its
"Where to go next" list. No such page exists and no redirect covers it, so it was a
live 404 on a customer-facing page.

One line changed:

- [Objects](/docs/build/objects) — the `ObjectSchema.create` authoring surface
+ [Data Model](/docs/build/data) — the `ObjectSchema.create` authoring surface

Repoint vs redirect — decided on evidence

Repoint. /docs/build/objects has never existed as a page in this repository.

• git log --all --diff-filter=D over content/docs/build/ lists every deletion the
  section has ever had: the six packages.{locale}.mdx files and five *.cn.mdx
  files. No objects.mdx.
• Widening past deletions to the whole history — walking git ls-tree -r over every
  commit reachable from every ref — finds no path matching docs/build/objects at any
  point.
• By contrast the four sources already in the redirect table (data-model, views,
  actions, flows) each have real commit history at content/docs/build/{name}.mdx.
  That table's meaning is "this URL was live and the Build restructure moved it".

A URL that never resolved cannot be in anyone's bookmark, index, or external link as a
working address, so a redirect would be dead config — and a fifth entry of a different
kind would blur what the table documents. apps/docs/next.config.mjs is untouched.

Why /docs/build/data, labelled "Data Model"

content/docs/build/data/index.mdx still documents ObjectSchema.create after #82's
17.0 alignment pass — 7 occurrences, including the located-error note on abstract.
Its frontmatter title is Data Model, and all 19 other English links to that page label
it "Data Model" / "Data model", never "Objects". The trailing description is unchanged
and still accurate.

Locale siblings — reported, not edited

All six carry the same dead link and are left alone as generated artifacts:

File	Line
content/docs/configure/data-sources.de.mdx	267
content/docs/configure/data-sources.es.mdx	260
content/docs/configure/data-sources.fr.mdx	272
content/docs/configure/data-sources.ja.mdx	179
content/docs/configure/data-sources.ko.mdx	179
content/docs/configure/data-sources.zh-Hans.mdx	214

They clear when the translation pass regenerates them from this English source. The
existing gates already carry the work item: after this change
check-translation-output.mjs reports a url finding on each of the six naming
/docs/build/objects exactly, where the baseline reported none — measured by restoring
the origin/main file, re-running, and restoring the branch file (116 findings / 0
data-sources url hits before, 122 / 6 after; non-blocking, blocking on 0 changed translation(s)).

Verification, all at 4176b4a

• turbo run type-check --filter=@objectos/docs --force — cache bypass, force executing 0edb23119da91b7f, 1 successful.
• turbo run build --filter=@objectos/docs --force — cache bypass, force executing b2ef76cdbd3badb4, 1 successful.
• Rendered HTML read: apps/docs/.next/server/app/en/docs/configure/data-sources.html
  now contains a href="/docs/build/data" >Data Model and zero occurrences of
  docs/build/objects.
• The target prerenders: .next/server/app/en/docs/build/data.html exists, 254,982
  bytes, title reads Data Model | ObjectOS — plus the six locale variants.
• Ownership gate: 0 translation artifacts touched, 1 other file.
• Freshness gate: passed. The six data-sources.* siblings join the stale list, which
  is non-blocking by design.
• Output validator self-test: 20 cases, every rule demonstrated able to fail.
• Output gate: passed.
• Control-byte self-scan on the changed file: clean.

Corpus re-sweep — reported, not fixed

Re-ran the sweep that found this card with all three of its stated narrowings widened:
locale siblings included, link forms extended to reference-style definitions, JSX
href= (quoted and braced) and bare URLs, and #fragment anchors resolved against
each page's generated heading ids.

• English, 79 files, 504 internal /docs/... links (the original narrow run saw 502):
  0 missing pages, 0 missing anchors with this fix applied.
• Locale siblings, 256 files, 1,207 links: the only missing-page hits are the six copies
  of this same link, listed above.
• Two zh-Hans anchor hits were checked by hand and are false positives of the sweep,
  not findings — permission-sets#委托管理delegated-administration and
  permissions#诊断与审计 resolve correctly against their own locale sibling's headings.

No second broken link found, so there is no follow-up card to file. Sweep script kept
out of the diff.

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