fix(domains): restore fill_form and set_checked, drop the stale fork

domains/forms.ts was a stale fork of form.ts imported only by a manual
test. It held two working tools the registry never registered: fill_form
and set_checked. Ported both onto the current pattern and deleted the
fork; form.ts versions of the shared tools win.

The fork's tools took ref as Type.Integer (a raw CDP backendNodeId).
browser_snapshot has since moved to string refs ('e7') resolved through
the session ref map, so as written the tools were not callable at all.
Ported them onto resolveRefToObjectId and Type.String refs; the only
user-facing strings that changed are the four that documented the old
[ref=N] syntax. All page-side JS is carried byte-for-byte.

form.ts exceeded 250 lines, so fillForm moved to form-batch.ts per the
single-field/batch split. form.ts is still 425 lines — the pre-existing
three tools account for that, so the split does not reach the target.

test/manual/forms-test.ts is repointed and adapted to publish an 'eN'
ref map, but NOT executed — it needs a live Chrome. Type-checked only.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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