* docs: document /connect command and model catalog
Add a /connect row to the slash-commands reference (English and Chinese)
and a new "/connect and the model catalog" section in providers.md that
covers the bundled catalog, --refresh, --url, and the relationship with
hand-written config.toml entries.
* chore(changeset): trim /connect changesets to user-facing wording
Drop internal phrasing (pruned snapshot, "not gated by models.dev",
fallback mechanics, and the Anthropic catalog base URL path fix that
landed alongside the initial /connect implementation) so the release
notes describe behavior users can observe, not implementation details.
* docs(zh): translate "catalog/flag/endpoint" in /connect section
Rework the Chinese wording for the /connect docs: render "model catalog"
as "模型目录" (with the English term in parentheses on first use), drop
the leftover English "flag"/"endpoint" usage, and smooth out the
translationese in the surrounding sentences.
Update the cross-link anchor in slash-commands.md to match the new
Chinese heading.
* docs(en): tighten /connect wording
Fix the subject/verb mismatch in the /connect step description (the
sentence switched subjects mid-list), replace "endpoint" with the more
accurate "URL" since the catalog source is a static JSON file, and
clarify that /connect is limited to the provider types in the table
above rather than to whatever the catalog happens to cover.
* chore(changeset): keep connect-model-catalog changelog to one line
Defer --refresh, --url, and metadata details to the new docs section
(`/connect` and the model catalog in configuration/providers.md). The
changelog now just announces the command exists.
