Drops the four CF provider classes and their two test files. The
OpenRouter AI Gateway path is unaffected — it reads
prautoblogger_ai_gateway_base_url via class-open-router-config.php
directly, with no dependency on the CF support class.
Leaves class-cost-tracker.php line 165 'cloudflare-workers-ai' label
intact for historical log integrity.
Part of v0.10.0 (removing CF Workers AI as image provider).
See convo/prautoblogger/threads/2026-04-cloudflare-workers-ai-removal/.
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