feat: add AWS Bedrock authentication support

[Fl0p]

• Detect CLAUDE_CODE_USE_BEDROCK env var for Bedrock auth
• Hide OAuth login UI for Bedrock users (auth via AWS credentials)
• Pass isBedrock flag through auth status to frontend

Summary by CodeRabbit

• New Features
  • Added support for AWS Bedrock as a Claude authentication option
  • Simplified authentication experience for Bedrock users
  • Authentication status now indicates Bedrock connection method

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[coderabbitai]

Walkthrough

This PR adds AWS Bedrock authentication support to Claude credential checking. A new isBedrock flag is introduced in the authentication status payload, propagated from server to client, and used to conditionally hide login UI for Bedrock-authenticated users. The server now checks an environment variable to enable Bedrock mode, bypassing local credential file reading.

Changes

Cohort / File(s)	Summary
Bedrock Authentication Support server/routes/cli-auth.js	Added Bedrock path detection via CLAUDE_CODE_USE_BEDROCK env variable; /claude/status endpoint now includes isBedrock flag and derives auth method as 'bedrock' or 'credentials_file' based on this flag; early return for Bedrock auth with email set to 'AWS Bedrock'
Bedrock Authentication Support src/components/Settings.jsx	Integrated isBedrock flag from auth status payload into Claude auth state object; defaults to false when absent
Bedrock Authentication Support src/components/settings/AccountContent.jsx	Added conditional guard to hide login/re-authentication UI when authStatus.isBedrock is true; login button and related auth UI now only render for non-Bedrock users

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A Bedrock path now lights the way,
Where AWS credentials dance and play,
The login button hops aside so clean,
For Bedrock users, a serene scene,
Authentication flags hop through the stack! 🌟

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add AWS Bedrock authentication support' accurately describes the main objective of the pull request, which adds support for AWS Bedrock as an authentication method.

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✨ Finishing touches

• 📝 Generate docstrings

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