- Add Claude Sonnet 4.5 (global.anthropic.claude-sonnet-4-5-20250929-v1:0) to registry
- Update all Anthropic models to use bedrock/converse/ endpoint with full ARNs
- Create comprehensive ModelConfig class for centralized provider settings
- Add alias system with raw ARNs for proper LiteLLM response resolution
- Refactor response processor to preserve exact LiteLLM response objects
- Simplify LLM service by merging prepare_params into make_llm_api_call
- Set stream_options include_usage as universal default for all models
- Remove scattered configuration functions in favor of registry-driven approach
- Fix pricing lookup by mapping provider model IDs back to registry entries