feat: bedrock_endpoint_url

[2284730142]

add bedrock_endpoint_url for users who need a proxy

Summary

Added bedrock_endpoint_url configuration option to allow users to customize the AWS Bedrock endpoint URL. This change is primarily intended for:

1. Users who need to access Bedrock services through a proxy
2. Users utilizing private VPC endpoints
3. Users who need to connect to Bedrock services in different regions

Motivation and Context

In certain enterprise environments, network security policies require accessing AWS Bedrock services through specific proxies or private endpoints. Adding this configuration option enhances system flexibility, enabling service usage across more scenarios.

Dependencies

• No new dependencies added
• Compatible with existing AWS Bedrock client configuration

Fixes #12926

Screenshots

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Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

Please link an existing issue or create an issue.:)

[2284730142]

@crazywoola Thanks for the reminder! I've created an issue #12926 to track this feature request.

The issue describes the need for a custom Bedrock endpoint URL configuration in enterprise environments where direct access to AWS services is restricted by security policies. This enhancement would help users who:

• Need to route traffic through corporate proxies
• Use private VPC endpoints
• Connect to different regional endpoints

I've updated the PR description to link to the issue using the "Fixes #12926" syntax. Let me know if you need any additional information or clarification.