* fix(bedrock): improve AWS credential handling and add model definitions
- Change error to warning when AWS credentials are missing in environment
- Allow fallback to system configuration (aws config files or instance profiles)
- Remove hardcoded region and profile parameters in Bedrock client
- Add Claude 3.7 Sonnet and DeepSeek R1 model definitions for Bedrock
- Update config manager to properly handle Bedrock provider
* chore: cleanup and format and small refactor
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Co-authored-by: Ray Krueger <raykrueger@gmail.com>