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feat: add OpenRouter image provider for higher-quality image generation

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Replaces Cloudflare Workers AI (FLUX.1 schnell) as the default image
provider with OpenRouter, which offers FLUX.2 Pro, Seedream 3.0,
Gemini Flash Image, and GPT Image 1 at comparable or better pricing.

- New provider class (3-file split: provider, pricing, support) reuses
  the existing OpenRouter API key and Cloudflare AI Gateway
- Admin settings: new Image Provider dropdown (openrouter/cloudflare),
  model picker shows all available image models from both providers
- Image pipeline auto-selects the configured provider at construction
- Cost logging now uses actual model name instead of hardcoded flux-1-schnell
- Default model changed to black-forest-labs/flux-2-pro ($0.03/image)
- Unit tests for pricing resolution and provider response parsing

Cost impact: FLUX.2 Pro at $0.03/image vs schnell at $0.0007/image —
~43x more expensive per image, but dramatically better quality. At 2
images/article × 1 article/day = ~$1.80/month. Seedream 3.0 ($0.003)
available as a budget alternative.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
peptiderepo
2026-04-18 09:19:13 +07:00
parent b5e91ba3a6
commit 0a68741945
11 changed files with 852 additions and 44 deletions
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9
prautoblogger.php
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@@ -53,10 +53,11 @@ define( 'PRAUTOBLOGGER_DEFAULT_ANALYSIS_MODEL', 'google/gemini-2.5-flash-lite' )
define( 'PRAUTOBLOGGER_DEFAULT_WRITING_MODEL', 'google/gemini-2.5-flash-lite' );
define( 'PRAUTOBLOGGER_DEFAULT_EDITOR_MODEL', 'google/gemini-2.5-flash-lite' );
// Image generation defaults (Cloudflare Workers AI, FLUX family).
// Short alias; the Cloudflare image pricing helper expands it to the full
// `@cf/black-forest-labs/...` model id when building the Workers AI URL.
define( 'PRAUTOBLOGGER_DEFAULT_IMAGE_MODEL', 'flux-1-schnell' );
// Image generation defaults.
// Default provider is OpenRouter (higher quality); Cloudflare is the fallback.
// Default model is FLUX.2 Pro via OpenRouter (~$0.03/image, good quality).
define( 'PRAUTOBLOGGER_DEFAULT_IMAGE_PROVIDER', 'openrouter' );
define( 'PRAUTOBLOGGER_DEFAULT_IMAGE_MODEL', 'black-forest-labs/flux-2-pro' );
// CEO-approved image style suffix (decision locked 2026-04-15). Users may
// override via Settings → Images → Style Suffix; this constant is the