v0.12.0

Enable validation checks for 72 services

All service checks that were previously "detection only" now have
full validation. Checks verify env vars, SDK initialization, and
API configuration for:

- Payments: PayPal, Braintree, Paddle, LemonSqueezy
- Email Marketing: Mailchimp, ConvertKit, Beehiiv, AWeber,
  ActiveCampaign, CampaignMonitor, Drip, Klaviyo, Buttondown
- Auth: Auth0, Clerk, WorkOS, Firebase, Supabase
- Communication: Twilio, Slack, Discord, Intercom, Crisp
- Infrastructure: RabbitMQ, Elasticsearch, Convex
- Storage & CDN: AWS S3, Cloudinary, Cloudflare
- Search: Algolia
- AI: OpenAI, Anthropic, Google AI, Mistral, Cohere, Replicate,
  HuggingFace, Grok, Perplexity, Together AI
- Analytics: Fullres, Datafast, PostHog, Mixpanel, Hotjar,
  Amplitude, Segment
- Error Tracking: Bugsnag, Rollbar, Honeybadger, Datadog,
  NewRelic, LogRocket
- IndexNow

Total: 97 checks (72 services + 25 general)