Add Provider Doc

If you're maintaining documentation for an AI platform that integrates multiple providers like OpenAI or Anthropic, this automates the entire checklist. It walks you through creating bilingual usage docs with screenshots, updating environment variable references in English and Chinese, modifying all three Dockerfiles in the right spots, keeping .env.example in sync, and prepping image resources for the CDN. The workflow is opinionated but thorough, which is exactly what you want when onboarding a new provider. It's built for teams that need consistency across documentation and don't want to remember which files need updates. The placeholder reminders for API keys are a nice touch that prevents embarrassing commits.