feat: Add AWS Bedrock support

[HoussamOtarid]

Fixes #703

This PR adds AWS Bedrock as a new LLM provider to OpenSWE.

Changes

• AWS Bedrock Integration

  • Added @langchain/aws dependency for Bedrock support
  • Added Bedrock to the list of supported providers
  • Implemented AWS credential handling (Access Key ID, Secret Access Key, Region)
  • Added Bedrock-specific model configurations for all LLM tasks

• Model Support

  • Claude Sonnet 4 (us.anthropic.claude-sonnet-4-20250514-v1:0)
  • Claude Opus 4.1 (us.anthropic.claude-opus-4-1-20250805-v1:0)
  • Claude Opus 4 (us.anthropic.claude-opus-4-20250514-v1:0)
  • Claude 3.7 Sonnet (us.anthropic.claude-3-7-sonnet-20250219-v1:0)
  • Claude 3.5 Haiku (us.anthropic.claude-3-5-haiku-20241022-v1:0)

• UI Updates

  • Added AWS Bedrock configuration section in API Keys settings
  • Support for configuring AWS credentials (Access Key ID, Secret Access Key, Region)
  • Updated API key validation to check for required Bedrock credentials

• Configuration

  • Updated .env.example with AWS credential placeholders
  • Added Bedrock provider to model selection options
  • Ensured Bedrock uses Anthropic-compatible tool and message formats

Notes

• Bedrock models use the same tool and message formatting as Anthropic models as I only added support Anthropic models
• API Key settings page is a bit tricky to deal with as all supported providers have a single API key field, I tried to do minimal changes for supporting AWS Bedrock

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