feat: add Amazon Bedrock support with API key authentication

[devin-ai-integration]

Summary

Adds Amazon Bedrock as an LLM provider option using the new Bedrock API key authentication feature. This is a simpler approach than traditional AWS credentials (access_key_id, secret_access_key, region).

Changes:

• Added Bedrock provider entry in shared.tsx with api_key requirement
• Added amazon_bedrock case in useLLMConnection.ts using @ai-sdk/amazon-bedrock package
• Added documentation link in configure.tsx pointing to AWS Console for API key generation

Review & Testing Checklist for Human

• Hardcoded region: The region is hardcoded to us-east-1. Verify this is acceptable or if it should be user-configurable
• End-to-end test: Test with an actual Bedrock API key to verify the integration works correctly
• Verify the @ai-sdk/amazon-bedrock package's apiKey parameter works as expected with Bearer token auth

Test Plan

1. Go to Settings > AI > LLM
2. Select Amazon Bedrock provider
3. Enter a valid Bedrock API key (generated from AWS Console)
4. Select a model and test chat functionality

Notes

This replaces the more complex AWS credentials approach from PR #3005 with a simpler API key-based authentication.

Link to Devin run: https://app.devin.ai/sessions/6079ce2504d14c4685c5e6832e523fbd
Requested by: @yujonglee

[devin-ai-integration]

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