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Transform OpenAI-specific error handling into extensible multi-provider system that supports OpenAI, Google AI, Anthropic, Ollama, and future providers. ## Backend Enhancements - Add ProviderErrorAdapter pattern with provider-specific implementations - Create ProviderErrorFactory for unified error handling across providers - Refactor API key validation to detect and handle any provider - Update error sanitization to use provider-specific patterns - Add provider context to all error responses ## Frontend Enhancements - Rename interfaces from OpenAI-specific to provider-agnostic - Update error detection to work with any provider name - Add provider context to error messages and guidance - Support provider-specific error codes and classifications ## Provider Support Added ✅ OpenAI: sk-* keys, org/proj/req IDs, quota/rate limit patterns ✅ Google AI: AIza* keys, googleapis.com URLs, project patterns ✅ Anthropic: sk-ant-* keys, anthropic.com URLs ✅ Ollama: localhost URLs, connection patterns (no API keys) ## Error Message Examples - OpenAI: 'Invalid or expired OpenAI API key. Please check your API key in settings.' - Google: 'Invalid or expired Google API key. Please check your API key in settings.' - Anthropic: 'Invalid or expired Anthropic API key. Please check your API key in settings.' ## Security Features - Provider-specific sanitization patterns prevent data exposure - Auto-detection of provider from error content - Structured error codes for reliable classification - Enhanced input validation and ReDoS protection This addresses the code review feedback to make error handling truly generic and extensible for all LLM providers, not just OpenAI, while maintaining the same level of user experience and security for each provider.