Remove the Puter provider (id `puter`, alias `pu`) entirely, at the
request of Puter's owner, Nariman Jelveh:
- registry entry (open-sse/config/providers/registry/puter/) and
PuterExecutor (open-sse/executors/puter.ts), with their registrations
- API-key preset card (gateways.ts), provider icon and public SVG asset
- 33 free-model catalog entries (pool `puter`)
- authHint i18n key across all 43 UI locales
- credential-requirement frozen-list entry and related comments
- docs: ARCHITECTURE, CODEBASE_DOCUMENTATION, FREE_TIERS (removal note),
PROVIDER_REFERENCE regenerated (337 providers), translated doc mirrors,
llm.txt + its 42 i18n mirrors, README/AGENTS/package.json counts
(338→337 providers, 144→145 migrations) and the 5 canonical SVGs
- migration 152 cleans up stored puter connections/keys/custom models;
historical usage records are preserved (same principle as migration 151)
- regression guard: tests/unit/puter-provider-removed.test.ts; puter
fixtures in shared tests swapped for neutral providers; translate-path
golden snapshot regenerated
Historical CHANGELOG mentions are intentionally preserved; the removal
carries its own CHANGELOG entry.
Co-authored-by: backryun <bakryun0718@proton.me>
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